#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 t, a, b;
    f >> t;
    for (int i = 1; i <= t; i++) {
        f >> a >> b;
        g << cmmdc(a, b) << '\n';
    }

    return 0;
}