use proconio::{input};

fn main() {
    input!{
        n: usize, x: i64, y: i64,
    }
    if x==y{
        println!("0");
        return;
    } else if y&1==0{
        println!("-1");
        return;
    }
    let mut query = vec![n.to_string()];
    let mut x = true;
    let mut pre = 0;
    for i in (0..n).rev(){
        if y & 1<<i > 0{
            if x{
                x = false;
                pre = i;
            } else {
                query.push((pre-i).to_string());
                pre = i;
            }
        }
    }
    println!("{}\n{}", query.len(), query.join(" "));

}