#include <iostream>
#include <fstream>>
#include <vector>
#include <string>

int main(void) {

	//std::ifstream inf("Text.txt");	std::cin.rdbuf(inf.rdbuf());

	int N = 0;
	std::cin >> N;
	
	std::vector<std::string> S(N), T(N);
	for (int i = 0; i < N; i++) {
		std::cin >> S[i];
	}
	for (int i = 0; i < N; i++) {
		std::cin >> T[i];
	}

	int ans = 0;
	while (S[ans] == T[ans]) {
		ans++;
	}

	std::cout << ans + 1 << "\n" << S[ans] << "\n" << T[ans] << std::endl;

	return 0;
}