def letter_checker(string):
input_str = string.lower()
for letter in input_str:
if input_str.count(letter) > 1:
return False
return True
print(letter_checker("Dermatoglyphics"))
print(letter_checker("isogram"))
print(letter_checker("aba"))
print(letter_checker("moOse"))
print(letter_checker("isIsogram"))
print(letter_checker("")
Check multiple character in a string
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