#include<stdio.h>

int gcd(int a, int b)
{
    int r;

    while(b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int t,a,b;

    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);

    scanf("%d",&t);
    while(t--)
    {
        scanf("%d%d",&a,&b);
        printf("%d\n",gcd(a,b));
    }
    return 0;
}