import java.io.PrintStream;
import java.util.Scanner;
import type.lib.ToolBox;

public class RedOrBlueOrYellow 
{
    public static void main(String[] args) 
    {
	Scanner input = new Scanner(System.in);
	PrintStream output = System.out;
		
	output.println("0 : red");
	output.println("1 : blue");
	output.println("2 : yellow");
	output.print("Enter your choice: ");
	int choice = input.nextInt();
	String result;
	if (choice == 0) 
	{
	    result = "red";
	} 
	else if (choice == 1) 
	{
	    result = "blue";
	} 
	else if (choice == 2) 
	{
	    result = "yellow";
	} 
	else 
	{
	    ToolBox.crash(true, "invalid choice");
	    result = "invalid"; // needed to make compiler happy
	}
	output.println(result);
    }
}