


"""simple docstring"""







def      lowercase			(				A_  ,   A_       )->      float:
  '''simple docstring'''







  if mass < 0:
    raise ValueError("The mass of a body cannot be negative"       )
  return 0.5 * mass * abs(A_       ) * abs(A_       )


if __name__ == "__main__":
 import doctest

 doctest.testmod(verbose=True)










"""simple docstring"""







def      lowercase			(				A_       )->      bool:
  '''simple docstring'''







  if not all(x.isalpha() for x in string       ):
    raise ValueError("String must only contain alphabetic characters."       )

  a						:		Tuple      							=			sorted(string.lower()       )
  return len(A_       ) == len(set(A_       )       )


if __name__ == "__main__":
 __lowercase    					=      input("""Enter a string """).strip()

 __lowercase    					=      is_isogram(input_str)
 print(f'''{input_str} is {'an' if isogram else 'not an'} isogram.''')






