class Coordinate: def __init__(self, x, y): self.x = x self.y = y def __add__(self, other): return Coordinate(self.x + other.x, self.y + other.y) xy_1 = input() xy_2 = input() x_1, y_1 = map(int, xy_1.split()) x_2, y_2 = map(int, xy_2.split()) c1 = Coordinate(x_1, y_1) c2 = Coordinate(x_2, y_2) c = ...