#include<iostream>
#include<fstream>
using namespace std;

ifstream f ("euclid2.in");
ofstream g ("euclid2.out");

int euclid( int a, int b )
{
    int r;

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

int main()
{
    int n, a, b;

    f >> n;

    for ( int i = 0; i < n; ++ i )
    {
        f >> a >> b;
        g << euclid( a, b ) << '\n';
    }

    return 0;
}