

"""simple docstring"""






def   lowercase_	(    _lowercase       :		list[int]							,      _lowercase       :		list[int]	):




					'''simple docstring'''






					if not len(_lowercase	) == len(_lowercase	) == 3:
										raise ValueError("Please enter a valid equation."	)
					if equationa[0] == equationa[1] == equationa[0] == equationa[1] == 0:
										raise ValueError("Both a & b of two equations can't be zero."	)

					# Extract the coefficients
					UpperCAmelCase      ,							UpperCAmelCase      ,							UpperCAmelCase			:   Union[str, Any]      =				equationa
					UpperCAmelCase      ,							UpperCAmelCase      ,							UpperCAmelCase			:   List[str]      =				equationa

					# Calculate the determinants of the matrices
					UpperCAmelCase			:   Optional[Any]      =				aa * ba - aa * ba
					UpperCAmelCase			:   Any      =				ca * ba - ca * ba
					UpperCAmelCase			:   Any      =				aa * ca - aa * ca

					# Check if the system of linear equations has a solution (using Cramer's rule)
					if determinant == 0:
										if determinant_x == determinant_y == 0:
															raise ValueError("Infinite solutions. (Consistent system)"	)
										else:
															raise ValueError("No solution. (Inconsistent system)"	)
					else:
										if determinant_x == determinant_y == 0:
															# Trivial solution (Inconsistent system)
															return (0.0, 0.0)
										else:
															UpperCAmelCase			:   Any      =				determinant_x / determinant
															UpperCAmelCase			:   int      =				determinant_y / determinant
															# Non-Trivial Solution (Consistent system)
															return (x, y)





"""simple docstring"""






def   lowercase_	(    _lowercase       :		str	):




					'''simple docstring'''






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

					UpperCAmelCase			:   Optional[int]      =				sorted(string.lower()	)
					return len(_lowercase	) == len(set(_lowercase	)	)


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

	snake_case_   :   str        =       is_isogram(input_str)
	print(f'''{input_str} is {"an" if isogram else "not an"} isogram.''')


