#include <bits/stdc++.h>
using namespace std;

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

int n, a, b;

long long calc(long long a,long long b)
{
    while (b > 0)
    {
        long long r = a % b;
        a = b;
        b = r;
    }

    return a;
}
int main()
{
    in >> n;

    for (int i = 0; i < n; i++)
    {
        in >> a >> b;
        out << calc(a, b) << "\n";
    }
    return 0;
}