#include <iostream>
#include <fstream>

using namespace std;

int cmmdc ( int a, int b )
{
    int r;
    while(b)
    {
        r = a%b;
        a=b;
        b=r;
    }
    return a;
}
ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

int main ()
{
    int t, a, b;
    fin>>t;

    for ( int i=1; i<=t; i++ )
    {
        fin>>a>>b;
        fout<< cmmdc (a, b) << '\n';
    }
    return 0;
}