#include<iostream>
#include<cstdio>
#include<algorithm>
#include<string>
using namespace std;


int main() {
	int n;
	string S[10], T[10];

	cin >> n;
	for (int i = 0; i < n; i++) cin >> S[i];
	for (int i = 0; i < n; i++) cin >> T[i];

	int i = 0;
	while (S[i] == T[i]) i++;
	cout << (i + 1) << endl;
	cout << S[i] << endl;
	cout << T[i] << endl;

	return 0;
}