#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <vector>
#include <map>
#include <set>
#include <algorithm>
#include <string>
#include <cstdlib>
#include <stack>
#include <queue>
#include <cmath>

#define rep(i,j,k) for(int i=(int)j;i<(int)k;i++)
#define repp(i,j,k) for(int i=j;i>=k;i--)
#define Sort(x) sort(x.begin(),x.end()); 
#define ll long long
int mod=1e9+7;
const int INF = 1e9;

using namespace std;


int main(void) {
	int n;
	cin >> n;
	vector<string> s, ss;
	string temp;
	rep(i, 0, n) {
		cin >> temp;
		s.push_back(temp);
	}

	rep(i, 0, n) {
		cin >> temp;
		ss.push_back(temp);
	}

	rep(i, 0, n) {
		if (s[i] != ss[i]) {
			cout << i + 1 << endl << s[i] << endl << ss[i] << endl;
		}
	}
	


	return 0;
}