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  1. while True:
  2.    try:
  3.       entrada = input()
  4.    except EOFError:
  5.       break
  6.  
  7.    letras_unicas = set([i for i in set(list(entrada)) if entrada.count(i) %2 != 0])
  8.  
  9.    if len(letras_unicas) > 1:
  10.       print(len(letras_unicas)-1)
  11.    else:
  12.       print(0)
  13.  
Success #stdin #stdout 0.04s 9344KB
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https://ideone.com/noedPr
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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