#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main(){
    int N; cin >> N;
    vector<string> v1;
    vector<string> v2;
    int ans;
    for(int i = 0; i < N; i++){
        string a;
        cin >> a;
        v1.push_back(a);
    }
    for(int i = 0; i < N; i++){
        string a;
        cin >> a;
        v2.push_back(a);
    }
    for(int i = 0; i < N; i++){
        if(v1[i] != v2[i])
            ans = i + 1;
    }
    cout << ans << endl;
    cout << v1[ans - 1] << endl;
    cout << v2[ans - 1] << endl;
    return 0;
}