#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <vector>
#include <math.h>
using namespace std;
#define int long long

signed main() {
	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];
	}
	int res;
	for (int i = 0; i < N; i++) {
		if (s[i] != t[i]) {
			res = i;
		}
	}
	cout << (res + 1) << endl;
	cout << s[res] << endl;
	cout << t[res] << endl;
	return 0;
}