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#include <bits/stdc++.h>
using namespace std;

#define mp make_pair
#define pb push_back
// #define st first
#define nd second
#define fi first
#define se second
#define vt vector
#define FOR(a, b, c)  for(int a=b; a<c; ++a)
#define all(a)     (a).begin(),(a).end()
#define sz(a)      (int)(a).size()

typedef long long ll;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef vector<int> vi; 
typedef vector<ll> vll;
typedef pii PII;
typedef pll PLL;

constexpr ll nax = 2969, INF = 1e9+2137;
constexpr ld eps = 1e-9;

mt19937_64 rng(6969);
// mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());

inline ll rand(ll l, ll r) {
	return uniform_int_distribution<ll>(l, r)(rng);
}

int n, m; 
vector<string> A;
vector<pair<char, pair<int, char>>> ans; 
int row[nax][30], col[nax][30]; 
bool vis_col[nax], vis_row[nax]; 

void do_row(int i) {
    for(int j = 0; j < m; j++) {
        if(A[i][j] == '?')
            continue; 
        col[j][A[i][j] - 'A']--; 
        row[i][A[i][j] - 'A']--; 
        col[j][26]++; 
        row[i][26]++; 
        A[i][j] = '?'; 
    }
}

void do_col(int i) {
    for(int j = 0; j < n; j++) {
        if(A[j][i] == '?')
            continue; 
        col[i][A[j][i] - 'A']--; 
        row[j][A[j][i] - 'A']--; 
        col[i][26]++; 
        row[j][26]++; 
        A[j][i] = '?'; 
    }
}

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> m; 

    A.resize(n); 
    for(auto &e: A) {
        cin >> e; 
    }
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            row[i][A[i][j] - 'A']++; 
            col[j][A[i][j] - 'A']++; 
        }
    }
    queue<pair<char, pair<int, char>>> q; 
    for(int i = 0; i < n; i++) {
        for(int letter = 0; letter < 26; letter++) {
            if(row[i][letter] > 0 && row[i][letter] + row[i][26] == m) {
                q.push(mp('R', mp(i, (char)(letter + 'A')))); 
                vis_row[i] = true; 
                do_row(i); 
            }
        }
    }
    for(int i = 0; i < m; i++) {
        for(int letter = 0; letter < 26; letter++) {
            if(col[i][letter] > 0 && col[i][letter] + col[i][26] == n) {
                q.push(mp('K', mp(i, (char)(letter + 'A')))); 
                vis_col[i] = true; 
                do_col(i); 
            }
        }
    }

    while(!q.empty()) {
        pair<char, pair<int, char>> cur = q.front(); 
        q.pop(); 
        ans.pb(cur); 
        int nr = cur.se.fi; 
        char letter = cur.se.se; 
        char which = cur.fi; 
        if(which == 'R') {
            // vis_row[nr] = true; 
            for(int i = 0; i < m; i++) {
                if(vis_col[i])
                    continue; 
                // col[i][26]++; 
                for(int j = 0; j < 26; j++) {
                    if(col[i][j] > 0 && col[i][j] + col[i][26] == n) {
                        q.push(mp('K', mp(i, (char)(j + 'A')))); 
                        vis_col[i] = true; 
                        do_col(i); 
                        break;
                    }
                }
            }
        }
        else {
            for(int i = 0; i < n; i++) {
                if(vis_row[i])
                    continue; 
                // row[i][26]++; 
                for(int j = 0; j < 26; j++) {
                    if(row[i][j] > 0 && row[i][j] + row[i][26] == m) {
                        q.push(mp('R', mp(i, (char)(j + 'A')))); 
                        vis_row[i] = true; 
                        do_row(i); 
                        break; 
                    }
                }
            }
        }
    }

    cout << ans.size() << "\n"; 
    reverse(all(ans)); 
    for(auto e: ans) {
        cout << e.fi << " " << e.se.fi + 1 << " " << e.se.se << "\n"; 
    }

    return 0;
}