// InfoArenaEuclid.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

//#include "pch.h"
#include <iostream>
#include <algorithm>    // std::swap
#include <fstream>

using namespace std;



int euclid(long a,long b) {
	if (a < b)
		std::swap(a, b);
	while (b != 0){
		a = a % b;
		std::swap(a, b);
	}
	return a;
}



int main()
{
	ifstream fin("euclid2.in");
	ofstream fout("euclid2.out");
	int numberOfTests;
	long firstNumber, secondNumber;
	fin >> numberOfTests;
	for (int i = 0; i < numberOfTests; ++i) {
		fin >> firstNumber >> secondNumber;
		fout << euclid(firstNumber, secondNumber)<<'\n';
	}
	
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file