int buttonPin = 2; // Digital pin where the button is connected.
int BLedPin = 4;  
int RLedPin = 7;
int GLedPin = 5;   // Digital pin where the LED is connected.
bool buttonState = false;

void setup() {
  // put your setup code here, to run once:
  pinMode(BLedPin, OUTPUT);    // LED pin as an output.
  pinMode(buttonPin, INPUT);
  pinMode(GLedPin, OUTPUT); 
  pinMode(RLedPin, OUTPUT); 
}

void loop() {
  // put your main code here, to run repeatedly:
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed
  if (buttonState == HIGH){
    digitalWrite(BLedPin, HIGH);
    digitalWrite(BLedPin, LOW);
    digitalWrite(GLedPin, HIGH); 
    digitalWrite(GLedPin, LOW);           // Turn LED on.
  } else {
    digitalWrite(RLedPin, HIGH);    // Turn LED off.
  }
}