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

int main() {
  int N; cin >> N;
  vector<string> S(N+1), T(N+1);
  for(int i = 1; i <= N; i++) cin >> S[i];
  for(int i = 1; i <= N; i++) cin >> T[i];
  for(int i = 1; i <= N; i++){
    if(S[i] != T[i]){
      cout << i << endl << S[i] << endl << T[i] << endl;
    }
  }
}