import java.io.*;
import java.util.*;

class BetterChoices
{
    public static void main(String[] args)
    {
        String color = "blue";
        if(color.equals("blue"))
        {
            System.out.println("blue");
        }
        else if(color.equals("red"))
        {
            System.out.println("red");
        }
        else if(color.equals("purple"))
        {
            System.out.println("purple");
        }
        else
        {
            System.out.println("who knows?");
        }
    }

}