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Write a python function isogram(S) that returns True if and only if no character appears more...

Write a python function isogram(S) that returns True if and only if no character appears more than once in the input string S.

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Answer #1

def isogram(str):
  
# Convert to lower case.
word = str.lower()
list = []
  
for ltr in word:
# check If letter is an alphabet
if ltr.isalpha():
if ltr in list:
return False
list.append(ltr)
  
return True
  
str=input("Enter String: ")
print(isogram(str))

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