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