#include <iostream>

using namespace std;

int main(void) {
  int n,i,j;
  string line;

  cin >> n;
  if (!cin)
    return 1;
  // n between 1 and 10
  if (n <= 0 || n > 10)
    return 2;

  if (cin.peek() != '\n')
    return 3;

  for (i=0;i<n;i++) {
    cin >> line;
    if (!cin)
      return 4;

    if (cin.peek() != '\n')
      return 5;

    if (line.length() != n)
      return 7;
    for (j=0;j<n;j++)
      if (line[j] != '.' && line[j] != 'X')
        return 8;
  }

  cin >> line;
  if (line.length() != n*n)
    return 9;
  for (i=0;i<n*n;i++)
    if (!islower(line[i]))
      return 10;

  // we win!
  return 42;
}