#include"testlib.h"
#include<iostream>
#include<vector>
#include<string>
#include<map>
#include<set>
#include<queue>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<random>
#include<stdio.h>
using namespace std;

typedef long long ll;
const long long MIN_N = 1;
const long long MAX_N = 200000;
const long long MIN_M = 1;
const long long MAX_M = 200000;
const long long MIN_a = 0;
const long long MAX_a = 1000000000;

void validate(){
  long long N = inf.readLong(MIN_N,MAX_N);
  inf.readSpace();
  long long M = inf.readLong(MIN_M,MAX_M);
  inf.readEoln();

  for (long long i=0;i<N;i++){
    inf.readLong(1,M);
    inf.readSpace();
    inf.readLong(1,N);
    inf.readEoln();
  }

  inf.readEof();
}

int main(int argc, char* argv[]){
  registerValidation(argc,argv);
  validate();
}