#include<iostream>
#include<string>

using namespace std;

int main() {
	
	int N;
	string S[10], T[10];
	
	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;

}