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#include<bits/stdc++.h>
 
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("trapv")
 
#define st first
#define nd second
#define pb push_back
#define pp pop_back
#define eb emplace_back
#define mp(a, b) make_pair(a, b)
#define all(x) (x).begin(), (x).end()
#define rev(x) reverse(all(x))
#define sor(x) sort(all(x))
#define sz(x) (int)(x).size()
#define rsz(x) resize(x)
 
using namespace std;
 
///~~~~~~~~~~~~~~~~~~~~~~~~~~
 
template <typename H, typename T> 
ostream& operator<<(ostream& os, pair<H, T> m){
	return os <<"("<< m.st<<", "<<m.nd<<")";
}
template <typename H> 
ostream& operator<<(ostream& os, vector<H> V){
	os<<"{";
	for(int i=0; i<V.size(); i++){
		if(i)os<<" ";
		os<<V[i];
	}
	os<<"}";
	return os;
}
 
void debug(){cerr<<"\n";}
template <typename H, typename... T>
void debug(H h, T... t) {cerr<<h; if (sizeof...(t)) cerr << ", "; debug(t...);}
#define deb(x...) cerr<<#x<<" = ";debug(x);
 
///~~~~~~~~~~~~~~~~~~~~~~~~~
 
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii > vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef string str;
 
#define BOOST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
 
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
 
const int N=2e5+5, INF=1e9+5, mod=1e9+7;
vi prep;
int solve(int n, int m, vector<vector<int> > V, bool b){
	while(true){
		//for(int i=0; i<n; i++){for(int j=0; j<m; j++){cout<<V[i][j]<<" \n"[j==m-1];}}cout<<"\n";
		int opt=25;
		for(int i=0; i<n; i++){
			for(int j=0; j<m; j++){
				if(!V[i][j])continue;
				int deg=0;
				if(i && V[i-1][j])deg++;
				if(i<n-1 && V[i+1][j])deg++;
				if(j && V[i][j-1])deg++;
				if(j<m-1 && V[i][j+1])deg++;
				if(deg){
					assert(V[i][j]%deg==0);
					if(V[i][j]/deg<opt){
						opt=V[i][j]/deg;
					}
				}
			}
		}
		//cout<<opt<<"\n";
		for(int i=0; i<n; i++){
			for(int j=0; j<m; j++){
				if(V[i][j]){
				if(i && V[i-1][j])V[i][j]-=opt, V[i-1][j]-=opt;
				if(j && V[i][j-1])V[i][j]-=opt, V[i][j-1]-=opt;
				}
			}
		}
		if(opt==25)break;
	}
	if(b==1){
		return V[0][m/2];
	}
	int ans=0;
	for(int i=0; i<n; i++){
		for(int j=0; j<m ;j++){
			ans+=V[i][j];
		}
	}
	return ans;
}
void gen(int n, int m){
	vector<vector<int> > V(n, vi(m));
	for(int i=0; i<(1<<(n*m)); i++){
		for(int j=0; j<(n*m);j ++){
			V[j/m][j%m]=(!!(i&(1<<j)))*24;
		}
		prep.pb(solve(n, m, V, n!=4));
	}
}
int main(){
	//BOOST;
	int n, m;
	cin>>n>>m;
	vector<str> co(n);
	vector<vector<int> > V(n, vi(m));
	//deb(solve(2, 1, {{24}, {24}}, 0));
	bool b=0;
	for(int i=0; i<n; i++){
		cin>>co[i];
		for(int j=0; j<m; j++){
			V[i][j]=24*(co[i][j]=='O');
			if(co[i][j]!='.' && !((i*j)%5)){
				b=0;
			}
		}
	}
	if(n<3){
		int d=1+n;
		gen(n, 2*d+1);
		ll ans=0;//mnoznik 2^20*24
		for(int i=0; i<n; i++){
			for(int j=0; j<m; j++){
				vector<int> zmi;
				int ile=0, ile2=0;
				for(int k=-d; k<=d; k++){
					if(j+k>=0 && j+k<m){
						//deb(k, d, ile, ile2);
						if(co[i][j+k]=='O')ile+=(1<<(k+d));
						if(co[i][j+k]=='?')ile2+=(1<<(k+d));
						if(n==2){
							if(co[i^1][j+k]=='O')ile+=(1<<(k+3*d+1));
							if(co[i^1][j+k]=='?')ile2+=(1<<(k+3*d+1));
						}
					}
				}
				//deb(i, j, ile, d, ile2);
				int po=20-__builtin_popcount(ile2);
				for(int mask=ile2; ; mask=(mask-1)&ile2){
					//deb(mask+ile, prep[mask+ile]);
					ans+=prep[mask+ile]<<po;
					if(mask==0)break;
				}
			}
		}
		ll x=24<<20;
		ll nwd=__gcd(ans, x);
		cout<<ans/nwd<<"/"<<x/nwd;
		return 0;
	}
	else{
		if(b){
			//deb("a");
			gen(4, 4);
			ll ans=0;
			for(int i=1; i<n; i+=5){
				for(int j=1;j<m; j+=5){
					int ile=0, ile2=0;
					for(int x=0; x+i<n && x<4; x++){
						for(int y=0; y+j<m && y<4; y++){
							if(co[i+x][j+y]=='O')ile+=(1<<(4*y+x));
							if(co[i+x][j+y]=='?')ile2+=(1<<(4*y+x));
						}
					}
					int po=20-__builtin_popcount(ile2);
					for(int mask=ile2; ; mask=(mask-1)&ile2){
						//deb(mask+ile, prep[mask+ile]);
						ans+=prep[mask+ile]<<po;
						if(mask==0)break;
					}
				}
			}
			ll x=24<<20;
			ll nwd=__gcd(ans, x);
			cout<<ans/nwd<<"/"<<x/nwd;
			return 0;
		}
		ll ans=0;
		vii zmi;
		for(int i=0; i<n; i++){
			for(int j=0; j<m; j++){
				if(co[i][j]=='?')zmi.eb(i, j);
			}
		}
		for(int mask=0; mask<(1<<zmi.size()); mask++){
			for(int i=0; i<zmi.size(); i++){
				if(mask&(1<<i))V[zmi[i].st][zmi[i].nd]=24;
				else V[zmi[i].st][zmi[i].nd]=0;
			}
			//deb(V, solve(n, m, V, 0));
			ans+=solve(n, m, V, 0);
		}
		ll x=24<<zmi.size();
		ll nwd=__gcd(ans, x);
		cout<<ans/nwd<<"/"<<x/nwd;
		return 0;
	}
}