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