#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <cmath>

#define AS(a) (sizeof(a)/sizeof(a[0]))
using namespace std;
long long int MOD = 1000000007;
long long int INF = 1000000007;


int main() {
  int N;
  cin >> N;
  string S[N];
  string T[N];
  for(int i = 0; i < N; i++) {
    cin >> S[i];
  }
  for(int i = 0; i < N; i++) {
    cin >> T[i];
  }
  for(int i = 0; i < N; i++) {
    if(S[i].length() != T[i].length()) {
      cout << (i+1) << endl;
      cout << S[i] << endl;
      cout << T[i] << endl;
      break;
    }
    for(int j = 0; j < S[i].length(); j++) {
      if(S[i][j] != T[i][j]) {
        cout << (i+1) << endl;
        cout << S[i] << endl;
        cout << T[i] << endl;
        return 0;
      }
    }
  }

}