#include <fstream>

using namespace std;
ifstream f("euclid2.in");
ofstream g("euclid2.out");

int T;
int cmmdc(int a, int b)
{
    int r=a%b;

    while(r)
    {
        a=b;
        b=r;
        r=a%b;
    }

    return b;
}

int main()
{
    int a,b,i;
    f >> T;

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

    return 0;
}