#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 n ;
    f >> n ;
    for ( int i = 1 ; i <= n ; i ++ )
    {
        int a , b ;
        f >> a >> b ;
        g << gcd(a,b) << endl ;
    }
    return 0;
}