class Point:
  
    def __init__(self, x = 0, y = 0):
      self.x = x
      self.y = y
  
    def __sub__(self, other):
        x = self.x + other.x
        y = self.y + other.y
        return Point(x,y)
        
point1 = Point(30, 40)
point2 = Point(10, 20)
point3 = point1 - point2
print(point3.x, point3.y)