#include <stdio.h>

using namespace std;

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