#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<string> S(N);
  for (int i = 0; i < N; i++){
    cin >> S[i];
  }
  vector<string> T(N);
  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 << endl;
      cout << S[i] << endl;
      cout << T[i] << endl;
    }
  }
}