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