#include <stdio.h>
int cmmdc(int a,int b)
{
if (!b) return a;
return cmmdc(b,a%b);
}

int main(void)
{
freopen("euclid2.in","r",stdin);
freopen("euclid2.out","w",stdout);
int n,a,b;
scanf("%d",&n);
for (;n;--n)
{

	scanf("%d %d", &a,&b);
	printf("%d\n",cmmdc(a,b));
}
return 0;
}