#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <set>
using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  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" << S[i] << "\n" << T[i];
      break;
    }
  }


  return 0;
}