#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    int r;
    while (b)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
    int n, i, a, b;
    ifstream f("euclid.in");
    ofstream g("euclid.out");
    f>>n;
    for (i=1; i<=n; i++)
    {
        f>>a>>b;
        g<<cmmdc(a, b)<<endl;
    }
    f.close();
    g.close();
    return 0;
}