#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define vi vector<int>
#define vll vector<ll>
#define vvi vector<vector<int> >
#define pii pair<int, int>
#define rep(i,n) for(int i = 0;i < n; i++)
#define Rep(i,n) for(int i = 1;i <= n; i++)
int n;

int main(){
    cin >> n;
    vector<string> s(n);
    rep(i, n)cin >> s[i];
    rep(i, n){
        string t;
        cin >> t;
        if(s[i] != t){
            cout << i + 1 << endl;
            cout << s[i] << endl << t << endl;
            return 0;
        }
    }
    return 0;
}