// euclid2.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <fstream>

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

long T, a, b;

long GCD(long A, long B)
{
    if (!B)
        return A;
    return GCD(B, A % B);
}

int main()
{
    in >> T;
    for (; T; --T)
    {
        in >> a >> b;
        out << GCD(a, b) << '\n';
    }
    return 0;  
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file