#include <iostream>
#include <fstream>
using namespace std;
int a,b,t;
int cmmdc(int g,int h)
{
    if (a%b==0) return b;
       else return cmmdc(b,a%b);
}
int main()
{
    ifstream f("euclid2.in");
    ofstream g("euclid2.out");
    f>>t;
    for (int i=1;i<=t;i++)
    {
        f>>a>>b;
        g<<cmmdc(a,b);
    }
    f.close();
    g.close();
    return 0;
}