char seq[5];

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  seq [0] = 'a';
  seq [1] = '3';
  seq [3] = 50;
}

void loop() {
  // put your main code here, to run repeatedly:
  for (int i = 0; i < 5; i++)
  {
    Serial.println(seq[i]);
    delay(500);
  }
  Serial.println("--- Esco dalla funzione loop() ---");
}