#include <bits/stdc++.h>
using namespace std;

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

	int ans;
	string s, t;
	for( int i = 0; i < N; i++ ) {
		if( S[i] != T[i] ) {
			ans = i + 1;
			s = S[i];
			t = T[i];
			break;
		}
	}

	cout << ans << endl << s << endl << t << endl;
}