char code[5] = {'2', '0', '6', '1', '8'};
char getCode[5];
int isCorrect = 0;
void setup() {
  Serial.begin(9600);
  for (int i = 0; i < 5; i++) {
    while (Serial.available() == 0);
    getCode[i] = Serial.read();
    if (getCode[i] == code[i]) {
      isCorrect++;
    }
  }
  if (isCorrect == 5 ) {
    Serial.println("Welcome");
  }
  else {
    Serial.println("Wrong code, try again");
  }
}

void loop() {
}