class Coordinate: def __init__(self, x, y): self.x = x self.y = y def __add__(self): self.x = x1 + x2 self.y = y1 + y2 def __str__(self): print("({}, {})".format(self.x,self.y)) x1, y1 = map(int, input().split()) x2, y2 = map(int, input()...