from keypad import*

def display_message(line1, line2=""):
    lcd_start()
    string_write(line1)
    cmd_wrt(0xC0)  # Move to the second line
    string_write(line2)

def main():
    while True:
        key = keyread()
        if key != 0:
            if key == 'A':
                display_message("embedded")
            elif key == 'B':
                display_message("subject")
            elif key == 'C':
                cmd_wrt(0x01)  # Clear the LCD
            else:
                # Display the pressed value at the center of line 2
                cmd_wrt(0x01)  # Clear the LCD
                display_message("", zfl(key, 8))
            sleep(0.2)  # Adjust as needed

if __name__ == "__main__":
    main()