class Coordinate(object): def __init__(self, x, y): self.x = x self.y = y def __str__(self): return f"({self.x}, {self.y})" def __add__(self, other): return Coordinate(self.x + other.x, self.y + other.y) x1, y1 = list(map(int, input().split())) x2, y2 = list(map(int, input().split())) c1 =...