use std::io::Read;

fn solve(abc: Vec<f64>) {
    let a = abc[0];
    let b = abc[1];
    let c = abc[2];
    if a == 0f64 {
        if b == 0f64 {
            if c == 0f64 {
                println!("{}", -1);
            } else {
                println!("{}", 0);
            }
        } else {
            println!("{}", 1);
            println!("{:.12}", -c / b);
        }
        return;
    }
    let temp = b * b - 4f64 * a * c;
    if temp > 0.0 {
        println!("{}", 2);
        let base = if b < 0f64 { (-b + temp.powf(0.5f64)) / (2.0f64 * a) } else { (-b - temp.powf(0.5f64)) / (2.0f64 * a) };
        let other = c / (a * base);
        if base < other {
            println!("{:.12}", base);
            println!("{:.12}", other);
        } else {
            println!("{:.12}", other);
            println!("{:.12}", base);
        }
    } else if temp == 0.0 {
        println!("{}", 1);
        println!("{:.12}", -b / (2.0f64 * a));
    } else {
        println!("{}", 0);
    }
}

fn main() {
    let mut abc = String::new();
    std::io::stdin().read_to_string(&mut abc).ok();
    let abc: Vec<f64> = abc.trim().split('\n').next().unwrap().trim().split_whitespace().map(|i| i.parse::<f64>().unwrap()).collect();
    solve(abc);
}