/* -*- coding: utf-8 -*-
 *
 * 547.cc: No.547 未知の言語 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 10;

/* typedef */

/* global variables */

string ss[MAX_N], ts[MAX_N];

/* subroutines */

/* main */

int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) cin >> ss[i];
  for (int i = 0; i < n; i++) cin >> ts[i];

  for (int i = 0; i < n; i++)
    if (ss[i] != ts[i]) {
      printf("%d\n%s\n%s\n", i + 1, ss[i].c_str(), ts[i].c_str());
      break;
    }
  return 0;
}