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