#include <bits/stdc++.h>   using namespace std;   int n;   int a[111][111];   char c[111];   int main() {     int i, j, k;     int p, q, r;     int t, tt, ttt;     scanf( %d , &n);     for (i = 1; i <= n; i++) {       scanf( %s , c);       for (j = 1; j <= n; j++) {         if (c[j - 1] ==  E )           a[i][j] = 1;         else           a[i][j] = 0;       }     }     for (i = 1; i <= n; i++) {       for (j = 1; j <= n; j++) {         if (a[i][j] == 0) break;       }       if (j == n + 1) break;     }     if (i != n + 1) {       for (j = 1; j <= n; j++) {         for (i = 1; i <= n; i++) {           if (a[i][j] == 0) break;         }         if (i == n + 1) break;       }       if (j != n + 1) {         printf( -1 );       } else {         for (j = 1; j <= n; j++) {           for (i = 1; i <= n; i++) {             if (a[i][j] == 0) {               printf( %d %d n , i, j);               break;             }           }         }       }     } else {       for (i = 1; i <= n; i++) {         for (j = 1; j <= n; j++) {           if (a[i][j] == 0) {             printf( %d %d n , i, j);             break;           }         }       }     }     scanf(   );     return 0;   }   