#include <cstdio>

int t,i,a,b;

int cmmdc(int a, int b)
{
    if (b==0) return a;
        else return cmmdc(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",cmmdc(a,b));
    }
    return 0;
}