#include <iostream.h>
#include <stdio.h>
 
using namespace std;
unsigned i,t,r,a,b;
 
int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);
    scanf("%d",&t);
    i=1;
    while(i<=t)
    {
        scanf("%d%d",&a,&b);
        while(b!=0)
        {
            r=a%b;
            a=b;
            b=r;
        }
            cout<<a<<endl;
            i++;
    }
}