# Author: OMKAR PATHAK

# ISOGRAM: An isogram (also known as a "nonpattern word") is a logological term for a word

# or phrase without a repeating letter

def is_isogram(word):

# Convert the word or sentence in lower case letters.

clean_word = word.lower()

# Make ann empty list to append unique letters

letter_list = []

for letter in clean_word:

# If letter is an alphabet then only check

if letter.isalpha():

if letter in letter_list:

return False

letter_list.append(letter)

return True

if __name__ == '__main__':

print(is_isogram("")) # True

print(is_isogram("isogram")) # True

print(is_isogram("eleven")) # False

print(is_isogram("subdermatoglyphic")) # True

print(is_isogram("Alphabet")) # False

print(is_isogram("thumbscrew-japingly")) # True

print(is_isogram("Hjelmqvist-Gryb-Zock-Pfund-Wax")) # True

print(is_isogram("Emily Jung Schwartzkopf")) # True

print(is_isogram("accentor")) # False