import math
class liczbaZespolona(object):
    def __init__(self, re, im):
        self.r = re
        self.i = im

    def __add__(self, other):
        self.re=self.r+other.r
        self.ie=self.i+other.i
        return "%s + %si" % (self.re, self.ie)
    def __sub__(self, other):
        self.re=self.r-other.r
        self.ie=self.i-other.i
        return "%s + %si" % (self.re, self.ie)
    def __mul__(self, other):
        self.re = (self.r*other.r - self.i*other.i)
        self.ie = (self.r*other.i + self.i*other.r)
        return "%s + %si" % (self.re, self.ie)
    def __div__(self, other):
        return (self.r*other.r + self.i*other.i)/(other.r ** 2 + other.i ** 2) + (self.i*other.r - self.r*other.i)/(other.r ** 2 + other.i ** 2)
    def modul(self):
        return math.sqrt(self.r ** 2 + self.i ** 2)


a = liczbaZespolona(2, 3)
b = liczbaZespolona(3, 4)

print a+b
print a-b
print a*b
print a/b
print a.modul()