class Solution:
    def complexNumberMultiply(self, a, b):
        """
        :type a: str
        :type b: str
        :rtype: str
        """
        (x,y) = a.split("+")
        (m,n) = b.split("+")
        (y, k) = y.split("i")
        (n, k) = n.split("i")
        # print( (int)x*(int)m - (int)n*(int)y )
        return str( int(x)*int(m) - int(n)*int(y) ) + "+" + str( int(x)*int(n) + int(m)*int(y) ) + "i"