#include <bits/stdc++.h>

using namespace std;

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

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

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;
}