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