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

int main() {

  int N;
  int cnt;
  cin >> N;
  vector<string> S(N),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] != T[i]){
      cout << i + 1 << "\n"
        << S[i] << "\n" << T[i] << endl;
    }
  }

  return 0;

}