#include<bits/stdc++.h>
using namespace std;
//#include<atcoder/all>
//using namespace atcoder;
using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
constexpr ll MAX = 2000000000000000000;
constexpr ld PI = 3.14159265358979;
constexpr ll MOD = 998244353;//2024948111;
ld dotorad(ld K){return PI * K / 180.0;}
ld radtodo(ld K){return K * 180.0 / PI;}
mt19937 mt;
void randinit(){srand((unsigned)time(NULL));mt = mt19937(rand());}
int main(){
    ll N,M;
    cin >> N >> M;
    vector<ll> A(N),P(N);
    for(ll i = 0;i < N;i++) cin >> A[i];
    for(ll i = 0;i < N;i++) cin >> P[i];
    vector<ll> ans;
    ll ans_s = M,l = -1;
    while(ans_s > 0){
        bitset<3000> b;
        b.set(0);
        tuple<ll,ll> a = make_tuple(MAX,-1);
        for(ll i = N - 1;i > l;i--){
            if(ans_s - A[i] >= 0 && b[ans_s - A[i]]){
                a = min(a,make_tuple(P[i],i));
            }
            b |= (b << A[i]);
        }
        l = get<1>(a);
        if(l == -1){
            cout << -1 << endl;
            return 0;
        }
        ans.emplace_back(l + 1);
        ans_s -= A[l];
    }
    cout << (ll)ans.size() << endl;
    for(ll i = 0;i < (ll)ans.size();i++) cout << ans[i] << " \n"[i == (ll)ans.size() - 1];
}