#include <iostream>

using namespace std;

int GCD(int a, int b) {//求最大公约数
    if (b == 0)
        return a;
    else
        return GCD(b, a % b);
}

int main() {
    int a, b;
    while (cin >> a >> b) {
        cout << GCD(a, b) << endl;
    }
    return 0;
}