#include <iostream>
#include <fstream>

using namespace std;

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

int cmmdc(int a, int b)
{
    if (b == 0)
        return a;
    return cmmdc(b, a % b);
}

int main()
{
    int n, a, b;
    f>>n;
    for (int i = 1; i <= n; i++)
    {
        f>>a>>b;
        g<<cmmdc(a, b)<<'\n';
    }
    return 0;
}