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(in...