using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (n, x, y) = ((int)c[0], c[1], c[2]);
        if (y % 2 == 0)
        {
            if (x == y)
            {
                WriteLine(0);
                WriteLine();
            }
            else
            {
                WriteLine(-1);
            }
            return;
        }
        var ones = BitList(y);
        var ans = new List<int>{ n };
        for (var i = 1; i < ones.Count; ++i) ans.Add(ones[i] - ones[i - 1]);
        WriteLine(ans.Count);
        WriteLine(string.Join(" ", ans));
    }
    static List<int> BitList(long n)
    {
        var bits = new List<int>();
        while (n > 0)
        {
            bits.Add((int)(n % 2));
            n >>= 1;
        }
        bits.Reverse();
        var ans = new List<int>();
        for (var i = 0; i < bits.Count; ++i)
        {
            if (bits[i] == 1) ans.Add(i);
        }
        return ans;
    }
}