Help me in solving PYTHONCH02 problem

My issue

convert to lower case and predict position while subtracting ‘a’ only if alphabet from each character, then what is error in my code

My code

def alphabet_position(text):
    # Your list comprehension goes here
    # Hint: Use ord() to get ASCII value and chr() to convert back to character if needed
    text = text.lower()
    print(text)
    result = [ord(x)-ord('a')+1 for x in text if x.isalpha()]
    return result

if __name__ == "__main__":
    input_string = input().strip()
    result = alphabet_position(input_string)
    print(result)

Learning course: Python Coding Challenges
Problem Link: Alphabet Position Mapper Practice Problem in Python Coding Challenges