#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     long long n;     cin >> n;     string s[n];     long long flg = 1;     long long ar[n];     for (long long i = 0; i < n; i++) {       cin >> s[i];       long long flag = 0;       long long pos = -1;       for (long long j = 0; j < n; j++) {         if (s[i][j] ==  . ) {           flag = 1;           pos = j;           break;         }       }       if (flag == 0) {         flg = 0;       }       ar[i] = pos;     }     if (!flg) {       flg = 1;       long long ar[n];       for (long long i = 0; i < n; i++) {         long long flag = 0;         long long pos = -1;         for (long long j = 0; j < n; j++) {           if (s[j][i] ==  . ) {             flag = 1;             pos = j;             break;           }         }         if (flag == 0) {           flg = 0;           break;         }         ar[i] = pos;       }       if (!flg)         cout << -1;       else {         for (long long i = 0; i < n; i++) {           cout << ar[i] + 1 <<     << i + 1 <<   n ;         }       }       return 0;     } else {       for (long long i = 0; i < n; i++) {         cout << i + 1 <<     << ar[i] + 1 <<   n ;       }     }   }   