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