#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 = 0; i < n; ++i) {
    if (s[i] != t[i]) {
      cout << i + 1 << '\n';
      cout << s[i] << '\n';
      cout << t[i] << '\n';
    }
  }
}