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

int main() {
  int N;
  cin >> N;
  vector<string> S(N), T(N);
  for (auto &s : S) cin >> s;
  for (auto &t : T) cin >> t;

  for (int i = 0; i < N; i++) {
    if (S.at(i) != T.at(i)) cout << i + 1 << "\n" << S.at(i) << "\n" << T.at(i) << "\n";
  }
}