#include<stdio.h>
int N,i,a,b;
int euclid(int a,int b)
{
	if(!b) return a;
	return euclid(b,a%b);
}
int main()
{
	freopen("euclid2.in","r",stdin);
	freopen("euclid2.out","w",stdout);
	scanf("%d",&N);
	for(i=1;i<=N;++i)
	{	scanf("%d%d",&a,&b);
		printf("%d\n",euclid(a,b));
	}
	return 0;
}