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