#include <bits/stdc++.h>

using namespace std;

ifstream fin ("euclid2.in");
ofstream fout ("euclid2.out");

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

signed main ()
{
    int n;
    fin >> n;
    for (int i=1; i<=n; i++)
    {
        int a, b;
        fin >> a >> b;
        fout << gcd(a,b) << '\n';
    }
    return 0;
}