#include <bits/stdc++.h>
#include "testlib.h"
using namespace std;
using ll = long long;
const ll MIN_N = 1;
const ll MAX_N = 200'000;
const ll MIN_S = 1;
const ll MAX_S = 1'000'000'000;

int main(){
	registerValidation();
	ll N = inf.readLong(MIN_N, MAX_N);
	inf.readEoln();
	for (int i = 0; i < N; i++){
		ll l = inf.readLong(MIN_S, MAX_S);
		inf.readSpace();
		ll r = inf.readLong(MIN_S, MAX_S);
		ensure(l < r);
		inf.readEoln();
	}
	inf.readEof();
}