class Complex(object):
    def __init__(self, real, imaginary):
        self.real = real
        self.imaginary = imaginary
        
    def __add__(self, no):
        return(Complex(self.real + no.real, self.imaginary + no.imaginary))
        
    def __sub__(self, no):
        return(Complex(self.real - no.real, self.imaginary - no.imaginary))
        
    def __mul__(self, no):
        real_part = (self.real * no.real) - (self.imaginary * no.imaginary)
        imaginary_part = (self.real * no.imaginary) + (self.imaginary * no.real)
        
        return(Complex(real_part, imaginary_part))

    def __truediv__(self, no):
        real = ((self.real * no.real) + (self.imaginary * no.imaginary)) / (no.real**2 + no.imaginary**2)
        imaginary = ((self.imaginary * no.real) - (self.real * no.imaginary)) / (no.real**2 + no.imaginary**2)
        return Complex(real, imaginary)
    def mod(self):
        return Complex(math.sqrt(self.real**2 + self.imaginary**2), 0)

    def __str__(self):
        if self.imaginary == 0:
            result = "%.2f+0.00i" % (self.real)
        elif self.real == 0:
            if self.imaginary >= 0:
                result = "0.00+%.2fi" % (self.imaginary)
            else:
                result = "0.00-%.2fi" % (abs(self.imaginary))
        elif self.imaginary > 0:
            result = "%.2f+%.2fi" % (self.real, self.imaginary)
        else:
            result = "%.2f-%.2fi" % (self.real, abs(self.imaginary))
        return result