#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<string>
#include<sstream>
#include<cmath>
#include<numeric>
#include<map>
#include<random>
#include<stack>
#include<queue>
#include<cassert>
using namespace std;
int inf = 1000000000;

int main(void) {
  int n;
  cin >> n;
  string s, t;
  for(int i=0; i<n; i++){
    cin >> s >> t;
    if( s != t ){
      cout << i + 1 << endl;
      cout << s << endl;
      cout << t << endl;
    }
  }

  return 0;
}