#include <stdio.h>

using namespace std;

int n,a,b;

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

int main()
{
    freopen("euclid2.in","r",stdin);
    freopen("euclid2.out","w",stdout);

    scanf("%d",&n);

    for (int i=1;i<=n;i++) {
        scanf("%d %d",&a,&b);
        printf("%d\n",gcd(a,b));
    }

    return 0;
}