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 = 1;
    for i in (1..n).rev(){
        if y & 1<<i == 0{
            x += 1;
        } else {
            query.push(x.to_string());
            x = 1;
        }
    }
    println!("{}\n{}", query.len(), query.join(" "));

}