#include <fstream>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");
 int cmmdc(int a, int b)
{
    int r;
    while (b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int t, a, b, i;
int main()
{
    f>>t;
    for (i=1;i<=t;i++)
    {
        f >>a>>b;
        g << cmmdc(a,b)<<"\n";
    }
}