using namespace std;
#include<stdio.h>

int euclids(int a, int b)
{
    if(a%b==0)
        return b;
    return euclids(b, a%b);
}

int main()
{
    int a,b,n;
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d",&n);
    for(int i=1;i<=n;++i)
    {   scanf("%d %d",&a, &b);
        printf("%d\n",euclids(a,b));
    }
    return 0;
}