#include <iostream>
#include <fstream>

using namespace std;

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

    do{
        r = a % b;
        a = b;
        b = r;
    }
    while (r != 0);

    return a;
}

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

    int n;
    int a;
    int b;

    f >> n;

    for(int i = 1; i <= n; i++)
    {
        f >> a >> b;
        g << cmmdc(a, b) << endl;
    }

    f.close();
    g.close();

    return 0;
}