text: def isUnique(str):
      str = str.replace(" ", "")  # remove all spaces
      hash_set = set()  # set to store unique elements
      for char in str:
          if char in hash_set:
              return False
          else:
              hash_set.add(char)
      return True
  
  
  if __name__ == "__main__":
      print(isUnique("hola"))
  