const int red = 2;
const int yellow = 6;
const int green = 9;


void setup() {

  Serial.begin(9600);
  Serial.println("Welcome to Programming");

   pinMode(red,OUTPUT);
   pinMode(yellow,OUTPUT);
   pinMode(green,OUTPUT);

}

void loop() {

  digitalWrite(red,HIGH);
  digitalWrite(yellow,LOW);
  digitalWrite(green,LOW);
  Serial.println("STOP");
  delay(5000);

  digitalWrite(yellow,HIGH);
  digitalWrite(red,LOW);
  digitalWrite(green,LOW);
  Serial.println("WAIT");
  delay(2000);
  
  digitalWrite(green,HIGH);
  digitalWrite(red,LOW);
  digitalWrite(yellow,LOW);
  Serial.println("GO");
  delay(5000);
  


  

}