def def_color(x, y):
    return 1 if (x + y) % 2 == 0 else 0


def get_direction(cur_coords, target_coords):
    x_dir = 0
    y_dir = 0
    x_s, y_s = cur_coords
    x_f, y_f = target_coords
    if x_f - x_s >= 0:
        x_dir = 1
    else:
        x_dir = 0
    if y_f - y_s >= 0:
        y_dir = 1
    else:
        y_dir = 0

    return (x_dir, y_dir)


def make_step(coords, direction):
    x, y = coords
    if sum(direction) == 2:
        return (x + 1, y + 1)
    elif sum(direction) == 0:
        return (x - 1, y - 1)
    else:
        if direction[0] == 0:
            if direction[1] == 1:
                return (x - 1, y + 1)
        else:
            return (x + 1, y - 1)


def main():
    start_x = int(input())
    start_y = int(input())

    target_x = int(input())
    target_y = int(input())

    finish_coords = (target_x, target_y)

    step_hist = [[start_x, start_y]]

    if def_color(start_x, start_y) != def_color(target_x, target_y):
        print("No")
        return

    while True:
        direction = get_direction(step_hist[-1], finish_coords)
        step_hist.append(make_step(step_hist[-1], direction))
        if step_hist[-1] == finish_coords:
            break

    print("Yes")
    step_hist.pop(0)
    print(len(step_hist))
    for x, y in step_hist:
        print(x, y)
    return


main()