#include <cstdio>

using namespace std;

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

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

    int N,a,b;
    scanf("%d",&N);
    while(N--){
        scanf("%d%d",&a,&b);
        printf("%d\n",gcd(a,b));
    }

    return 0;
}