// Arduino use C/C++ Programming
// C/C++ Programming is case-sensitive
const int ledPin = 12; // Pin connected to the LED (built-in LED on Arduino Uno)
const int ledVer =13;

void setup() {
    Serial.begin(9600); // Initialize serial communication
    pinMode(ledPin, OUTPUT); // Set LED pin as output
}

void loop() {
    char userInput;

    // Prompt the user for input
    Serial.println("Enter a letter:");
    while (!Serial.available()) {
        // wait for user input
    }

    userInput = Serial.read(); // Read the user's input

    // Check if the input is a valid letter (A-Z or a-z)
    if ((userInput >= 'A' && userInput <= 'Z') || (userInput >= 'a' && userInput <= 'z')) {
        digitalWrite(ledPin, HIGH); // Turn on the LED
        delay(1000); // Wait for 1 second
        digitalWrite(ledPin, LOW); // Turn off the LED
        
        digitalWrite(ledVer, HIGH); // Turn on the LED
        delay(1000); // Wait for 1 second
        digitalWrite(ledVer, LOW); // Turn off the LED
       
    }
}