#include "bits/stdc++.h"

#define rep(a,b) for(int a = 0;a < b;a++)
#define REP(i, x, n) for(int i = x; i < n; i++)
#define P(a) cout << a << endl
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
int dx[] = { 1, -1 , 0 , 0 };
int dy[] = { 0,  0,  1, -1 };
ll MOD = 1000000007;
unsigned long long str_to_int(std::string str) {
  unsigned long long ret;
  std::stringstream ss; ss << str;
  ss >> ret;
  return ret;
}

int main() {
    int n;
    vector<string> v;
    rep(i,2*n){
    	string tmp;
	cin >> tmp;
	v.push_back(tmp);
    }
    rep(i,n){
    	if(v[i] != v[i+n]){
	    printf("%d\n%s\n%s\n",i+1,v[i],v[i+n]);
	}
    }
}