#include <iostream>
#include <fstream>

using namespace std;

int t, a, b;

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

int main()
{
	ifstream fi("euclid2..in");
	ofstream fo("euclid2.out");
	
	fi>>t;
	for (t;t;--t) 
	{
		fi>>a>>b;
		fo<<cmmdc(a,b)<<"\n";
	}
	return (0);

}