use std::io::Read;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();
    let mut iter = buf.split_whitespace();

    let a: i64 = iter.next().unwrap().parse().unwrap();
    let b: i64 = iter.next().unwrap().parse().unwrap();
    let c: i64 = iter.next().unwrap().parse().unwrap();
    let d: i64 = iter.next().unwrap().parse().unwrap();

    let disc: i64 = (a - c) * (a - c) - 8 *  (b - d);

    if disc < 0 {
        println!("No");
    } else if disc == 0 {
        println!("Yes");
    } else {
        let p: f64 = (a + c) as f64 / 2.0;
        let q: f64 = (b + d) as f64 / 2.0;
        println!("{:.10} {:.10}", p, q);
    }
}