import string

while True:
    try:
        text = input('Your text goes here: ')
        if len(text)<2:
            raise
        else:
            for item in text:
                if item not in string.ascii_lowercase:
                    raise
    except:
        print('at least 2 characters are required and only letters are allowed, try again')
        continue
    else:
        if text == text[::-1]:

            print('This is a palindrome')
        else:
            print("This isn't a palindrome")
    finally:
        ask = input("Do you want to try again? y/n: ")
        if ask == 'y':
            pass
        elif ask == 'n':
            break
        else:
            print('invalid response, exiting')
            break