#include <iostream>
#include <fstream>

using namespace std;

int cmmdc(int a, int b)
{
    if (b==0)
        return a;
    return cmmdc(b, a % b);
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    long t,i;
    int x,y;
    f>>t;
    for (i=0;i<t;i++)
    {
        f>>x;
        f>>y;
        g<<cmmdc(x,y)<<"\n";
    }
    f.close();
    g.close();
    return 0;
}