#include<cstdio>
using namespace std;
int main(){
    freopen ("euclid2.in","r",stdin);
    freopen ("euclid2.out","w",stdout);
    int t,i,a,b,r;
    scanf ("%d",&t);
    for(i=1;i<=t;i++){
        scanf ("%d%d",&a,&b);
        if (a==0){
            r=a;
            a=b;
            b=r;
        }
        while(b>0){
            r=a%b;
            a=b;
            b=r;
        }
        printf ("%d\n",a);
    }
    return 0;
}