#include <iostream>
#include <fstream>

using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int cmmdc (int a,int b)
{
    int r;
    while(b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}

int main()
{
        int T,a,b;
        int i;
        fin>>T;
        for (i=1;i<=T;i++)
        {
            fin>>a>>b;
            fout<<cmmdc (a,b)<<endl;
        }

        fin.close();
        fout.close();
}