class Complex():
    def __init__(self, real, imag):
        self.a = real
        self.b = imag

    def __repr__(self):
        return "Complex(" + str(self.a) + ", " + str(self.b) + ")"

    def __str__(self):
        if self.a == 0 and self.b == 0:
            return '0'
        elif self.a == 0:
            return str(self.b) + "i"
        elif self.b == 0:
            return str(self.a)
        elif self.b < 0:
            return str(self.a) + " - " + str(-self.b) + "i"
        else:
            return str(self.a) + " + " + str(self.b) + "i"

    def conjugate(self):
        return Complex(self.a, -self.b)

    def __add__(self):
        if type(other) is int or type(other) is float:
            other = Complex(other, 0)

        return Complex(self.a + other.a, self.b + other.b)

    def __radd__(self):
        return self.__add__(other)

    def __sub__(self):

        return self + (other * -1)

    def __rsub__(self, other):
        return (self * -1) + other

    def __mul__(self):
        if type(other) is int or type(other) is float:
            other = Complex(other, 0)

        real = (self.a * other.a) - (self.b * other.b)
        imag = (self.a * other.b) + (self.b * other.a)

        return Complex(real, imag)

    def __rmul__(self):
        return self * other




c1 = Complex(2, 4)
c2 = 5
c3 = c2 - c1

print(c3)