use std::io::Read;

fn run() {
    let mut s = String::new();
    std::io::stdin().read_to_string(&mut s).unwrap();
    let mut it = s.trim().split_whitespace();
    let mut a: i64 = it.next().unwrap().parse().unwrap();
    let mut b: i64 = it.next().unwrap().parse().unwrap();
    let mut c: i64 = it.next().unwrap().parse().unwrap();
    if a == 0 {
        if b == 0 {
            if c == 0 {
                println!("-1");
            } else {
                println!("0");
            }
        } else {
            let ans = -c as f64 / b as f64;
            println!("1\n{:.12}", ans);
        }
        return;
    }
    let d = b * b - 4 * a * c;
    if d < 0 {
        println!("0");
        return;
    }
    if d == 0 {
        let ans = -b as f64 / (2 * a) as f64;
        println!("1\n{:.12}", ans);
        return;
    }
    if a < 0 {
        a *= -1;
        b *= -1;
        c *= -1;
    }
    if b > 0 {
        let x = (-b as f64 - (d as f64).sqrt()) / (2 * a) as f64;
        let y = (2 * c) as f64 / (-b as f64 - (d as f64).sqrt());
        println!("2\n{:.12}\n{:.12}", x, y);
    } else {
        let x = (2 * c) as f64 / (-b as f64 + (d as f64).sqrt());
        let y = (-b as f64 + (d as f64).sqrt()) / (2 * a) as f64;
        println!("2\n{:.12}\n{:.12}", x, y);
    }
}

fn main() {
    run();
}