#include <fstream>
using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");

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

int main()
{
    int T, a, b;
    f>>T;
    while(T--)
    {
        f>>a>>b;
        g<<gcd(a, b)<<'\n';
    }
    return 0;
}