class Coordinate(): def __init__(self, x, y): self.x = x self.y = y def __str__(self): return f'({self.x}, {self.y})' def __add__(self, other): if isinstance(other, Coordinate): return Coordinate(self.x + other.x, self.y + other.y) x1, y1 = list(map(int, input().split(' '))) x2, y2 = list(map(int, i...