#include <iostream>
#include <cstring>
#include <cstdlib>

using namespace std;

class Color
{
private:
    int r, g, b;

public:
    explicit Color(int r, int g = 0, int b = 0) : r(r), g(g), b(b)
    {
    }
    void show()
    {
        cout << r << "," << g << "," << b << endl;
    }
};

int main()
{
    Color c = Color(2, 3, 4);
    c.show();
    return 0;
}