byte a, k;
byte menuPos[10];


void setup() {
  Serial.begin(115200);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(3) == LOW) {
    a++;
    Serial.println(a);
    delay(200);
  }
  if (digitalRead(4) == LOW) {
    a++;
    Serial.println(a);
    delay(200);
  }

  if (digitalRead(2) == LOW) {
   
    if (a != 0) {
      menuPos[k] = a;
      k++;
    } else {
      menuPos[k] = 0;
      k--;
    }
    a=0;

    for (int i = 0; i <= 10; i++) {
      Serial.print(menuPos[i]);
      Serial.print(" ");
    }
    Serial.println();
  delay(300);
  }
}