char code1 = '2';
char code2 = '0';
char code3 = '6';
char code4 = '1';
char code5 = '8';
void setup() {
  Serial.begin(9600);
  while (Serial.available() == 0);
  char getCode1 = Serial.read();
  while (Serial.available() == 0);
  char getCode2 = Serial.read();
  while (Serial.available() == 0);
  char getCode3 = Serial.read();
  while (Serial.available() == 0);
  char getCode4 = Serial.read();
  while (Serial.available() == 0);
  char getCode5 = Serial.read();

  if (getCode1 == code1 && getCode2 == code2 && getCode3 == code3 && getCode4 == code4 && getCode5 == code5 ) {
    Serial.println("Welcome");
  }
  else {
    Serial.println("Wrong code, try again");
  }
}

void loop() {
}