#include<cstdio>



int cmmdc(int a, int b)
{
    if(b==0)
        return a;
    return cmmdc(b,a%b);
}


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