const int RED=23;
const int YELLOW=22;
const int GREEN=19;
void setup(){
  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  for(int i=10;i>0;i--){
    Serial.println(i);
    delay(1000);
  }
  digitalWrite(RED, HIGH);
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, LOW);
  Serial.println("Stop");
  delay(8000);
  for(int i=10;i>0;i--){
    Serial.println(i);
    delay(1000);
    }
  digitalWrite(RED, LOW);
  digitalWrite(YELLOW, LOW);
  digitalWrite(GREEN, HIGH);
  Serial.println("GO");
  delay(9000);
   for(int i=10;i>0;i--){
    Serial.println(i);
    delay(1000);
    }
  digitalWrite(RED, LOW);
  digitalWrite(YELLOW, HIGH);
  digitalWrite(GREEN, LOW);
  Serial.println("Wait");
  delay(3000);
}