#define ledRed 5
#define ledGreen 6
#define slideR 7
#define slideL 11

void setup() {
  pinMode(ledRed, OUTPUT);
  pinMode(ledGreen, OUTPUT);
  pinMode(slideR, INPUT_PULLUP);
  pinMode(slideL, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(slideL) == LOW) {
    digitalWrite(ledGreen, LOW);
    digitalWrite(ledRed, LOW);
    delay(200);
    digitalWrite (ledRed, HIGH);
    delay(200);
  }

  if (digitalRead(slideR) == LOW) {
    digitalWrite(ledRed, LOW);
    digitalWrite(ledGreen, HIGH);
    delay(200);
    digitalWrite(ledGreen, LOW);
    delay(200);
  }
}