#include <cstdio>
using namespace std;
int t,i,a,b;
int rezolva(int a, int b)
{
    if (!b) return a;
    return rezolva(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",rezolva(a,b));
    }
    return 0;
}