int relay = 8;
int buzzer = 12;
void setup() {
  Serial.begin(9600); // Initialize serial communication
   pinMode(relay, OUTPUT);
    pinMode(buzzer, OUTPUT);
    String str;
  Serial.println("Enter a string:");
  while (!Serial.available()) {} // Wait for user to input string
  delay(100); // Allow time for input to complete
  str = Serial.readString(); // Read the input string
  str.trim(); // Remove leading and trailing whitespaces
  if (isPalindrome(str)) {
    Serial.println("The string is a palindrome.");
    digitalWrite(relay, HIGH);
    delay(1000);
    digitalWrite(buzzer, HIGH);
    delay(1000);
    digitalWrite(buzzer, LOW);
    delay(1000);
    digitalWrite(relay, LOW);
    delay(1000);

  } else {
    Serial.println("The string is not a palindrome.");
  }
}

void loop() 
{
}

bool isPalindrome(String str) {
  int len = str.length();
  for (int i = 0; i < len / 2; i++) {
    if (str[i] != str[len - i - 1]) {
      return false; // If characters at symmetric positions don't match, not a palindrome
    }
  }
  return true; // If all characters match, it's a palindrome
}