#include<cstdio>
int n,a,b,i;
int cmmdc(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);
scanf("%d",&n);
for(i=1;i<=n;i++)
    {
    scanf("%d%d",&a,&b);
    printf("%d\n",cmmdc(a,b));
    }
return 0;
}