import math

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 = self.real * no.real - self.imaginary * no.imaginary
        imaginary = self.real * no.imaginary + self.imaginary * no.real
        return Complex(real, imaginary)

    def __truediv__(self, no):
        
        denominator = math.pow(no.real,2) + math.pow(no.imaginary,2)
        real = ((self.real * no.real) + (self.imaginary * no.imaginary)) / denominator
        imaginary = ((self.imaginary * no.real) - (self.real * no.imaginary)) / denominator
        return str(self.__class__(real, imaginary))

    def mod(self):
        real = math.sqrt(math.pow(self.real,2) + math.pow(self.imaginary,2))
        imaginary = 0
        return str(self.__class__(real, imaginary))