Problem:
Score : 200 points

Problem Statement

There is a square in the xy-plane. The coordinates of its four vertices are (x_1,y_1),(x_2,y_2),(x_3,y_3) and (x_4,y_4) in counter-clockwise order.
(Assume that the positive x-axis points right, and the positive y-axis points up.)

Takahashi remembers (x_1,y_1) and (x_2,y_2), but he has forgot (x_3,y_3) and (x_4,y_4).

Given x_1,x_2,y_1,y_2, restore x_3,y_3,x_4,y_4. It can be shown that x_3,y_3,x_4 and y_4 uniquely exist and have integer values.

Constraints

|x_1|,|y_1|,|x_2|,|y_2| \leq 100

(x_1,y_1) ≠ (x_2,y_2)

All values in input are integers.

Input

Input is given from Standard Input in the following format:

x_1 y_1 x_2 y_2

Output

Print x_3,y_3,x_4 and y_4 as integers, in this order.

Sample Input 1

0 0 0 1

Sample Output 1

-1 1 -1 0

(0,0),(0,1),(-1,1),(-1,0) is the four vertices of a square in counter-clockwise order.
Note that (x_3,y_3)=(1,1),(x_4,y_4)=(1,0) is not accepted, as the vertices are in clockwise order.

Sample Input 2

2 3 6 6

Sample Output 2

3 10 -1 7

Sample Input 3

31 -41 -59 26

Sample Output 3

-126 -64 -36 -131

Solution in Rust (1.15.1) (judge verdict: Accepted)

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
        .map(|e| e.parse().ok().unwrap()).collect()
}

struct Point {
    x: i16,
    y: i16,
}

impl Point {
    fn new(x: i16, y: i16) -> Point {
        Point { x: x, y: y }
    }
}

struct Vector2D {
    x: i16,
    y: i16,
}

impl Vector2D {
    fn new(x: i16, y: i16) -> Vector2D {
        Vector2D { x: x, y: y }
    }
}

fn main() {
    let line: Vec<i16> = read_vec();
    let a = Point::new(line[0], line[1]);
    let b = Point::new(line[2], line[3]);
    let v = calc_vector(&a, &b);
    let v2 = rotation_vector(&v);
    let c = add_vector(&b, &v2);
    let d = add_vector(&c, &rotation_vector(&v2));
    println!("{} {} {} {}", c.x, c.y, d.x, d.y);
}

fn calc_vector(a: &Point, b: &Point) -> Vector2D {
    Vector2D::new(b.x - a.x, b.y - a.y)
}

fn rotation_vector(v: &Vector2D) -> Vector2D {
    Vector2D::new(v.y * -1, v.x)
}

fn add_vector(p: &Point, v: &Vector2D) -> Point {
    Point::new(p.x + v.x, p.y + v.y)
}