#include<bits/stdc++.h>
#include"testlib.h"
using namespace std;
using ll = long long;

const ll Nmin = 1, Nmax = 5000;
const ll Kmin = 0, Kmax = 1'000'000'000;

int main(){
    registerValidation();
    ll n = inf.readLong(Nmin,Nmax);
    inf.readSpace();
    ll k = inf.readLong(Kmin,Kmax);
    inf.readEoln();
    for (ll i = 1; i <= n; i++){
        ll r = inf.readLong(i,n);
        inf.readSpace();
        ll x = inf.readLong(0,n*k);
        inf.readEoln();
    }
    inf.readEof();
}