#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <vector>
#include <algorithm>
#include <cstdio>
#include <string>
#include <cmath>
#include <iomanip>
#include <queue>

using namespace std;

char code[5][101] = {0};
char impCode[101] = {0};
int main() {
  freopen("input.txt", "r", stdin);
 // freopen("output.txt", "w", stdout);

  int n = 0;
  cin >> n;

  string str;

  for (int i = 0; i < 5; ++i)
  {
    cin >> str;
    for (int j = 0; j < str.length(); ++j)
    {
        code[i][j] = str[j];
    }  
  }


  for (int i = 0; i < n; ++i)
  {
    bool hasX = false;
    bool hasPoint = false;
    for (int j = 0; j < 5; ++j)
    {
        if (code[j][i] == '.')
            hasPoint = true;
        if (code[j][i] == 'X')
            hasX = true;
    }  
    if (hasX && hasPoint)
    {
        cout << -1 << endl;
        return 0;
    }
    if (hasX)
    {
        impCode[i] = 1;
        continue;
    }
    if (hasPoint)
    {
        impCode[i] = 2;
    }
  }

  for (int i = 0; i < n; ++i)
  {
    
  }
  vector<int> answer;
  

  return 0;
}