#define LED1 19
#define LED2 18
#define LED3 5
#define LED4 17
#define LED5 16

byte mode;
byte state;
const char Alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ_123456789#";

void setup() {
  Serial.begin(115200);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  pinMode(LED5, OUTPUT);
  
  state = random(6);
  BINLed(state);
  
  mode = random(1, 3);
  Serial.println(mode == 1 ? "+" : "-");
}

void loop() {
  static bool flagReady = false;

  if (Serial.available() > 0) {
    char value = Serial.read();
    bool found = false;

    for (int i = 0; i < sizeof(Alphabet) - 1; i++) {
      if (value == Alphabet[i]) {
        found = true;
        int newIndex;

        switch (mode) {
          case 1:
            newIndex = (i + state) % (sizeof(Alphabet) - 1);
            Serial.print(Alphabet[newIndex]);
            break;
          case 2:
            newIndex = (i - state + (sizeof(Alphabet) - 1)) % (sizeof(Alphabet) - 1);
            Serial.print(Alphabet[newIndex]);
            break;
        }
        break; // Выход из цикла, если символ найден
      }
    }

    if (found) {
      flagReady = false;
    }
  }

  if (Serial.available() == 0 && !flagReady) {
    Serial.println(" ");
    flagReady = true;
  }
}

void BINLed(byte count) {
  bool StateLed[5] = {0, 0, 0, 0, 0};
  for (int i = 0; i < count; i++) {
    StateLed[i] = true;
  }

  digitalWrite(LED5, StateLed[0]);
  digitalWrite(LED4, StateLed[1]);
  digitalWrite(LED3, StateLed[2]);
  digitalWrite(LED2, StateLed[3]);
  digitalWrite(LED1, StateLed[4]);
}