#include <stdio.h>
#include <stdlib.h>
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 i,n,a,b;
    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        scanf("%d %d",&a,&b);
        printf("%d\n",cmmdc(a,b));
    }

    return 0;
}