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

int main() {
  int n;
  cin >> n;
  vector<string> S(n);
  vector<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 = 1; i <= n; i++) {
    if (S[i-1] != T[i-1]) {
      cout << i << "\n" << S[i-1] << "\n" << T[i-1] << "\n";
    }
  }
  return 0;
}