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