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

int main() {
  int n;
  cin >> n;
  vector<string> s(n), t(n);
  for (auto& e : s) cin >> e;
  for (auto& e : t) cin >> e;
  for (int i = 0; i < n; i++) {
    if (s[i] != t[i]) {
      cout << i + 1 << "\n" << s[i] << "\n" << t[i] << endl;
    }
  }
  return 0;
}