class IllegalOperandException(Exception):
    def __init__(self, msg):
        # msg:string
        self.s = msg

    def __str__(self):
        return "Illegal Operand: " + self.s + "\n"


class IllegalRuntimeException(Exception):
    def __init__(self, msg):
        # msg:string
        self.s = msg

    def __str__(self):
        return "Illegal Runtime: " + self.s + "\n"