#include <stdio.h>

using namespace std;
int a,b,i,t,r;
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);
      r=a%b;
      while (r)
      {
       a=b;
       b=r;
       r=a%b;
      };
      printf("%d\n",b);
    };
    return 0;
}