//No.547 未知の言語
#include<iostream>
#include<string>
#include<vector>
using namespace std;

vector<string> LoadStr(int _N) {
	string tmp_str;
	vector<string> lstr;
	for (int i = 0; i < _N; i++) {
		cin >> tmp_str;
		lstr.push_back(tmp_str);
	}
	return lstr;
}
int main() {
	int N;
	cin >> N;
	vector<string> lang1 = LoadStr(N);
	vector<string> lang2 = LoadStr(N);

	int num;
	for (int i = 0; i < N; i++) {
		if (lang1[i] != lang2[i]) {
			num = i;
			break;
		}
	}
	cout << num+1<<endl;
	cout << lang1[num]<<endl;
	cout << lang2[num]<<endl;
	return 0;
}