using namespace std;
#include<stdio.h>

int euclids(int a, int b)
{
	if(a%b==0)
		return b;
	return euclids(b, a%b);
}

int main()
{
	int a,b,n;
	freopen("euclid2.in","r",stdin);
	freopen("euclid2.out","w",stdout);
	scanf("%d",&n);
	for(int i=1;i<=n;++i)
	{	scanf("%d %d",&a, &b);
		printf("%d\n",euclids(a,b));
	}
	return 0;
}