#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    freopen("euclid2.in", "r", stdin);
    freopen("euclid2.out", "w", stdout);

    int t;
    cin >> t;
    while (t--) {
        int a, b;
        cin >> a >> b;
        cout << gcd(a,b) << endl;
    }
    return 0;
}