#include<iostream>
#include<string>

using namespace std;

int main() {
	
	int N;
	string S[10], T[10];
	cin >> N;
	for (int s = 0; s < N; s++) {
		cin >> S[s];
	}
 
	for (int t = 0; t < N; t++) {
		cin >> T[t];
	}

	int nod;
	for (nod = 0; nod < N; nod++) {
		if (S[nod] != T[nod]) {
			nod++;
			break;
		}
	}
	cout << nod << endl;
	cout << S[nod] << endl;
	cout << T[nod] << endl;

	return 0;
}