import math

class Points(object):
    def __init__(self, x, y, z):
        self.x = x
        self.y = y
        self.z = z


    def __sub__(self, no):
        return Points(self.x - no.x, self.y - no.y, self.z - no.z)


    def dot(self, no):
         return self.x * no.x + self.y * no.y + self.z * no.z


    def cross(self, no):
        return Points(
            self.y * no.z - self.z * no.y,
            self.z * no.x - self.x * no.z,
            self.x * no.y - self.y * no.x
        )

        
    def absolute(self):
        return pow((self.x ** 2 + self.y ** 2 + self.z ** 2), 0.5)