#include <stdio.h>
int n,x,y;
int euclid(int a,int b)
{   int rest=0;
    while(b!=0)
        {
           rest=a%b;
           a=b;
           b=rest;

        }
    return a;
}
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        scanf("%d%d",&x,&y);
        printf("%d\n",euclid(x,y));
    }
return 0;
}