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void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.println("Type something:");
}

void loop() {
  if (Serial.available()) {
    char nextChar = Serial.peek();  // Look at the next character
    Serial.print("Next character will be: ");
    Serial.println(nextChar);

    char actualChar = Serial.read();  // Now actually consume it
    Serial.print("Read character: ");
    Serial.println(actualChar);
  }
}