INVALID_NUMBERS = "\tInvalid numbers !"
NO_COMPLEX_NUMBERS = "\tThere are no complex numbers registered !"
INVALID_OPTION = '\tInvalid option !'
GOOD_BYE = '\tGood bye !'
REAL_NUMBER = '\tReal number: '
IMAGINARY_NUMBER = '\tImaginary number: '
OPTION = '\tOption: '
START = '\tStart: '
END = '\tEnd: '
UNDO_SUCCESS = '\tUndo with success'
NO_UNDO_AVAILABLE = '\tNo undo available'
