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

long long int N, i;
string s;
vector<string> S, T;

int main(){
    scanf("%lld", &N);
    for(int i = 0; i < N; ++i){
        cin >> s;
        S.push_back(s);
    }
    for(int i = 0; i < N; ++i){
        cin >> s;
        T.push_back(s);
    }
    for(int i = 0; i < N; ++i){
        if(S[i] != T[i]){cout << i + 1 << endl << S[i] << endl << T[i] << endl;break;}
    }
    return 0;
}