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