#include <iostream>
#include <fstream>

using namespace std;

int gcd (int a, int b)
{
	if (!b) return a;
	return gcd (b, a % b);
}

int main ()
{
	int m,p;
	int n;	
	ifstream finput ("euclid2.in");
	finput>>n;
	ofstream foutput ("euclid2.out");
	for (int i = 1; i<=n; i++) 
		{
			finput>>m>>p;
			foutput<<gcd(m,p)<<'\n';
		}
	finput.close ();
	foutput.close ();
	return 0;
}