class Vector:
    def __init__(self,a,b):
        self.x = a
        self.y = b

    def __add__(self,other):
        return Vector(self.x + other.x,self.y + other.y)

    def __str__(self):
        return '(' + str(self.x) + ',' + str(self.y) + ')'

    def __mul__(left,right):
        return left.x * right.x + left.y * right.y

    def length(self):
        return(self * self) ** 0.5

class Point:
    def __init__(self,x,y):
        self.x = x
        self.y = y

    def __add__(left,right):
        return Point(left.x + right.x,left.y + right.y)

    def __str__(self):
        return Vector.__str__(self)

    def __mul__(left,right):
        if type(right) == Vector:
            return left.x * right.x + left.y * right.y
        else:
            return Vector(left.x * right.x + left.x * right.y)

    def __rmul__(left,right):
        return vector.__mul__(left,right)

    def __neg__(self):
        return Vector(-self.x,-self.y)

    def shift(self,v):
        self.x += v.x
        self.y += v.y