using System;

public class Program

{

    public static void Main()

    {

    string s;

   s = Console.ReadLine();

​

switch (s)

​

{

​

case "G":

Console.WriteLine("Green");

​

break;

​

case "B":

​

Console.WriteLine("Blue");

​

break;

​

    case "R":

​

Console.WriteLine("Red");

​

break;

​

        default:

​

Console.WriteLine("This is not (G,B or R)");

​

break;

    }

    }

}