#include <cstdio>
#include <vector>
#include <queue>
#include <cstring>

using namespace std;
int n, a, b, i;
int euclid (int a, int b)
{
    if(!b) return a;
    return euclid(b,a%b);
}
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);

    scanf("%d",&n);
    for(i=1; i<=n; i++)
    {
        scanf("%d %d",&a,&b);
        printf("%d\n",euclid(a,b));
    }
    return 0;
}