#include<cstdio>
using namespace std;
int cmmdc(int a,int b)
{
   if (b==0)
       return a;
    else
       return cmmdc(b,a%b);
}
int main()
{
    int i,x,y,n;
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d",&n);
    for (i=1;i<=n;++i)
    {
        scanf("%d%d",&x,&y);
        printf("%d\n",cmmdc(x,y));
    }
    return 0;
}