#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <bitset>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint998244353;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using vvvll = vector<vvll>;
using vmi = vector<mint>;
using vvmi = vector<vmi>;
using vvvmi = vector<vvmi>;
#define all(a) (a).begin(), (a).end()
#define rep2(i, m, n) for (int i = (m); i < (n); ++i)
#define rep(i, n) rep2(i, 0, n)
#define drep2(i, m, n) for (int i = (m)-1; i >= (n); --i)
#define drep(i, n) drep2(i, n, 0)


int main(){

    int n; ll x, y; cin >> n >> x >> y;
    if(x == y){
        cout << 0 << endl;
        return 0;
    }
    if(y%2 == 0){
        cout << -1 << endl;
        return 0;
    }
    vi ans(1, n);
    bitset<64> bs(y);
    int itr = 63;
    while(!bs[itr])itr--;
    int b = 1;
    drep(i, itr){
        if(!bs[i]){
            b++;
        }else{
            ans.push_back(b);
            b = 1;
        }
    }
    cout << ans.size() << endl;
    for(auto i : ans)cout << i << " ";
    cout << endl;
    return 0;
}