#include <bits/stdc++.h>

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

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

int main()
{
    int T, a, b;
    f >> T;
    for(int i = 1;i <= T; ++i)
    {
        f >> a >> b;
        g << Euclid(a,b);
        g << '\n';
    }
    return 0;
}