#include <bits/stdc++.h>

using ll = std::int64_t;

int main(){
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    int N;
    ll X, Y;
    std::cin >> N >> X >> Y;

    if(X == Y){
        std::cout << 0 << std::endl;
        return 0;
    }

    if(Y == 1){
        std::cout << 1 << std::endl;
        std::cout << N << std::endl;
        return 0;
    }

    if(__builtin_popcountll(Y) <= 1){
        std::cout << -1 << std::endl;
        return 0;
    }

    std::vector<int> A{N};
    int prev_i = -1;
    for(int i=N-1;i>=0;i--){
        if(Y >> i & 1){
            if(prev_i != -1){
                A.emplace_back(prev_i - i);
            }
            prev_i = i;
        }
    }

    std::cout << A.size() << std::endl;
    for(int i=0;i<A.size();i++){
        std::cout << A[i] << " \n"[i + 1 == A.size()];
    }
}