int LED1 = 5;
int LED2 = 4;
int btn = 7; 

void setup() {
  // put your setup code here, to run once:
pinMode(LED1, OUTPUT);
pinMode(LED2, OUTPUT);
pinMode(btn, INPUT_PULLUP);
digitalWrite(LED1, LOW);
digitalWrite(LED2, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
if(digitalRead(btn) == LOW){
  digitalWrite(LED1, HIGH);
  digitalWrite(LED2, LOW);
  delay(5000);
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, HIGH);
  delay(7000);
  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
}
}