#define RED 18
#define YELLOW 5
#define GREEN 17
#define BLUE 16
#define SWITCH_PIN 12

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
  pinMode(SWITCH_PIN, INPUT);
}

void loop() {
  int c = digitalRead(SWITCH_PIN);
  if (c == HIGH) { 
    digitalWrite(RED, HIGH);
    digitalWrite(YELLOW, HIGH);
    delay(1000);
    digitalWrite(RED, LOW);
    digitalWrite(YELLOW, LOW);
  } else {  
    digitalWrite(GREEN, HIGH);
    digitalWrite(BLUE, HIGH);
    delay(1000);
    digitalWrite(GREEN, LOW);
    digitalWrite(BLUE, LOW);
  }
}