int red=8;
int yellow=12;
int green=7;
int bz=2;
void setup() {
  // put your setup code here, to run once:
pinMode(8, OUTPUT);
pinMode(7, OUTPUT);
pinMode(12, OUTPUT);
pinMode(bz, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(8, HIGH);
delay(900);
digitalWrite(12, HIGH);
delay(800);
digitalWrite(7, HIGH);


digitalWrite(8,LOW);
delay(900);
digitalWrite(12,LOW);
delay(800);
digitalWrite(7, LOW);

tone(bz,600);
  delay(900);
  noTone(bz);
  delay(100);
}