#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;

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

    return 0;
}