Q2

#include <iostream>
using namespace std;

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

int main() {
    int a, b;
    while (cin >> a >> b) {
        cout << gcd(a, b) << endl;
    }
}