#include<cstdio>
using namespace std;

int div(int a,int b)
{
    int r;
    while(b>0)
    {
        r=a%b;
        a=b;
        b=r;
    }
 return a;
}

int main()
{
    freopen("euclid2.in","r",stdin);freopen("euclid2.out","w",stdout);

    int n,i,a,b;
    scanf("%d",&n);

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