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