import java.util.Scanner;
public class MyApp {
public static void main(String[] args) {
System.out.print("Signal? ");
String signal = new Scanner(System.in).next();
switch (signal) {
case "red":
System.out.println("Stop");
break;
case "yellow":
System.out.println("Slow down");
break;
case "blue":
case "green":
System.out.println("Go");
break;
default:
System.out.println("Wrong signal");
break;
}
}
}