#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)

int main(void)
{
  int n;
  cin >> n;
  vector<string> s(n), t(n);
  rep(i, n) cin >> s[i];
  rep(i, n) cin >> t[i];

  int ans;
  rep(i, n)
  {
    if (s[i] != t[i])
    {
      ans = i + 1;
      break;
    }
  }

  cout << ans << endl;
  cout << s[ans - 1] << endl;
  cout << t[ans - 1] << endl;
  return 0;
}