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

#define REP(i,n) for (int i = 0; i < (n); ++i)

char arr[30][30];

int cnts[30];

int main() {
  int n;
  while (scanf("%d", &n) == 1) {
    REP(i, 26) cnts[i] = 0;
    REP(i, n) scanf("%s", arr[i]);
    REP(i, n) {
      REP(j, n) {
        ++cnts[arr[i][j] - 'A'];
      }
    }
    char missing=0;
    REP(i, 26) {
      if (cnts[i] == n-1) missing = i + 'A';
    }
    REP(i, n) {
      REP(j, n) {
        bool ok = true;
        REP(k, n) {
          if (arr[i][k] == missing) ok = false;
        }
        REP(k, n) if (arr[k][j] == missing) ok = false;
        if (ok) {
          printf("%d %d %c\n", i + 1, j + 1, missing);
        }
      }
    }
  }
  return 0;
}