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// Arti1990, II UWr

#include <bits/stdc++.h>

#define forr(i, n)                  for(int i=0; i<n; i++)
#define FOREACH(iter, coll)         for(auto iter = coll.begin(); iter != coll.end(); ++iter)
#define FOREACHR(iter, coll)        for(auto iter = coll.rbegin(); iter != coll.rend(); ++iter)
#define lbound(P,K,FUN)             ({auto SSS=P, PPP = P-1, KKK=(K)+1; while(PPP+1!=KKK) {SSS = (PPP+(KKK-PPP)/2); if(FUN(SSS)) KKK = SSS; else PPP = SSS;} PPP;})
#define testy()                     int _tests; cin>>_tests; FOR(_test, 1, _tests)
#define CLEAR(tab)                  memset(tab, 0, sizeof(tab))
#define CONTAIN(el, coll)           (coll.find(el) != coll.end())
#define FOR(i, a, b)                for(int i=a; i<=b; i++)
#define FORD(i, a, b)               for(int i=a; i>=b; i--)
#define MP                          make_pair
#define PB                          push_back
#define ff                          first
#define ss                          second
#define deb(X)                      X;

#define M 1000000007
#define INF 1000000007LL

using namespace std;

int n, m, maxdeg;
string str[1007];
int dd[4][2] = {{-1, 0}, {1, 0}, {0, 1}, {0, -1}};
int degg[1007][1007];

struct ulamek
{
    long long l, m;
};
ulamek tab[1007][1007], czas;
ulamek dp[1007][2][2][2];

int deg(int i, int j)
{
    int rr = 0;
    forr(d, 4)
    {
        int ni = i + dd[d][0];
        int nj = j + dd[d][1];
        if(ni >= 0 && ni < n && nj >= 0 && nj < m && tab[ni][nj].l > 0)
            rr++;
    }
    return rr;
}

int policz_maxdeg()
{
    maxdeg = 0;
    forr(i, n)
        forr(j, m)
        {
            if(tab[i][j].l > 0)
            {
                degg[i][j] = deg(i, j);
//                cout << i << " " << j << " ma deg " << degg[i][j] << '\n';
                maxdeg = max(maxdeg, degg[i][j]);
            }
        }
    return maxdeg;
}

void wypisz()
{
    forr(i, n)
    {
        forr(j, m)
            printf("%1lld/%1lld ", tab[i][j].l, tab[i][j].m);
        printf("\n");
    }
}

void skroc(ulamek &u)
{
    if(u.l == 0)
    {
        u.m = 1;
        return;
    }
    long long g = __gcd(u.l, u.m);
    u.l /= g;
    u.m /= g;
}

void dodaj(ulamek &u, ulamek &v)
{
    u.l = u.l*v.m + v.l*u.m;
    u.m *= v.m;
    skroc(u);
}

bool comp(ulamek u, ulamek v)
{
    return u.l*v.m < v.l*u.m;
}

int solve()
{
    cin >> n >> m;
    int zap = 0;
    forr(i, n)
    {
        cin >> str[i];
        for(auto el : str[i])
            if(el == '?')
                zap++;
    }

    if(n == 1 && zap > 5)
    {
        ulamek jeden, minus_jeden;
        jeden.l = jeden.m = 1;
        minus_jeden.l = -1;
        minus_jeden.m = 1;
        FOR(i, 0, m)
            FOR(b, 0, 1)
                FOR(c, 0, 1)
                    FOR(d, 0, 1)
                    {
                        dp[i][b][c][d].l = 0;
                        dp[i][b][c][d].m = 1;
                    }
        FOR(i, 1, m)
            FOR(b, 0, 1)
                FOR(c, 0, 1)
                    FOR(d, 0, 1)
                    {
                        FOR(a, 0, 1)
                        {
                            ulamek ppb = jeden;
                            int pos = i-4;
                            if(a == 0 && (pos >= 0 && str[0][pos] == 'O'))
                                ppb.l = 0;
                            if(a == 1 && (pos < 0 || str[0][pos] == '.'))
                                ppb.l = 0;

                            pos = i-3;
                            if(b == 0 && (pos >= 0 && str[0][pos] == 'O'))
                                ppb.l = 0;
                            if(b == 1 && (pos < 0 || str[0][pos] == '.'))
                                ppb.l = 0;

                            pos = i-2;
                            if(c == 0 && (pos >= 0 && str[0][pos] == 'O'))
                                ppb.l = 0;
                            if(c == 1 && (pos < 0 || str[0][pos] == '.'))
                                ppb.l = 0;

                            pos = i-1;
                            if(d == 0 && (pos >= 0 && str[0][pos] == 'O'))
                                ppb.l = 0;
                            if(d == 1 && (pos < 0 || str[0][pos] == '.'))
                                ppb.l = 0;

                            ulamek ppb2 = ppb;
                            FOR(j, i-4, i-1)
                                if(j >= 0 && str[0][j] == '?')
                                    ppb2.m *= 2;

                            FOR(j, i-1, i-1)
                                if(j >= 0 && str[0][j] == '?')
                                    ppb.m *= 2;

                            //cout << a << " " << b << " " << c << " " << d << '\n';
                            //cout << "ppb: " << ppb.l << "/" << ppb.m << '\n';

                            ulamek u = dp[i-1][a][b][c];
                            u.l *= ppb.l;
                            u.m *= ppb.m;
                            dodaj(dp[i][b][c][d], u);

                            if(d == 1)
                            {
                                if((c == 0) || (a == 0 && b == 1 && c == 1))
                                {
                                    dodaj(dp[i][b][c][d], ppb2);
                                }

                                if(b == 0 && c == 1)
                                {
                                    ppb2.l *= -1;
                                    dodaj(dp[i][b][c][d], ppb2);
                                    ppb2.l *= -1;
                                }
                            }
                            skroc(dp[i][b][c][d]);
                        }
                        //cout << "dp[" << i << "][" << b << "][" << c << "][" << d << "] = " << dp[i][b][c][d].l << "/" << dp[i][b][c][d].m << '\n';
                    }

        ulamek res;
        res.l = 0;
        res.m = 1;
        FOR(a, 0, 1)
            FOR(b, 0, 1)
                FOR(c, 0, 1)
                    dodaj(res, dp[m][a][b][c]);
        cout << res.l << "/" << res.m << '\n';

        return 0;
    }

    ulamek res;
    res.l = 0;
    res.m = 1;
    forr(mask, (1<<zap))
    {
        int nr = 0;
        forr(i, n)
            forr(j, m)
            {
                if(str[i][j] == '?')
                {
                    tab[i][j].l = ((mask & (1<<nr)) > 0);
                    nr++;
                }
                else if(str[i][j] == 'O')
                    tab[i][j].l = 1;
                else
                    tab[i][j].l = 0;

                tab[i][j].m = 1;
            }
//        cout << "maska: " << mask << '\n';
        //wypisz();

        while(policz_maxdeg() > 0)
        {
//            cout << "maxdeg: " << maxdeg << '\n';
            czas.l = czas.m = 1;
            forr(i, n)
                forr(j, m)
                {
                    if(tab[i][j].l > 0)
                    {
                        skroc(tab[i][j]);
                        ulamek u = tab[i][j];
                        u.m *= degg[i][j];
                        if(comp(u, czas))
                            czas = u;
                    }
                }
            czas.l *= 1;
//            cout << "czas: " << czas.l << "/" << czas.m << '\n';

            forr(i, n)
                forr(j, m)
                    if(tab[i][j].l > 0)
                    {
                        ulamek u = czas;
                        u.l *= -degg[i][j];
                        dodaj(tab[i][j], u);
                    }
//            cout << "po czasie 1/" << maxdeg << '\n';
            //wypisz();
        }
        forr(i, n)
            forr(j, m)
            {
//                cout << " dodaje " << tab[i][j].l << "/" << tab[i][j].m << " do " << res.l << "/" << res.m << '\n';
                dodaj(res, tab[i][j]);
            }
//        cout << "res: " << res.l << "/" << res.m << '\n';
    }
    res.m <<= zap;
    skroc(res);

    cout << res.l << "/" << res.m << '\n';


    return 0;
}

int main()
{
    std::ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    solve();

    return 0;
}