#include <iostream>
#include <stdio.h>
using namespace std;
int euclid(int x,int y)
{
    int r;
    while(y)
    {
        r=x%y;
        x=y;
        y=r;
    }
    return x;
}
int main()
{
   freopen("euclid2.in","r",stdin);
   freopen("euclid2.out","w",stdout);

   int t,a,b;

   scanf("%d",&t);

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