#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//const long nPrime = 1000000007;
//const long nPrime = 998244353;
typedef long long ll;
int main() {
    ll n,m;
    cin >> n >> m;
    vector<ll> viA(n),viP(n);
    for(ll i = 0; i < n; i++){
        cin >> viA[i];
    }
    for(ll i = 0; i < n; i++){
        cin >> viP[i];
    }
    
    vector<vector<int>> vviDP(n+1,vector<int>(m+1,0));
    vviDP[n][0] = 1;
    for(ll i = n-1; i >= 0; i--){
        for(ll j = 0; j <= m; j++){
            if(vviDP[i+1][j] != 0){
                vviDP[i][j] = 1;
            }
        }
        for(ll j = 0; j + viA[i] <= m; j++){
            if(vviDP[i+1][j] != 0){
                vviDP[i][j+viA[i]] = 2;
            }
        }
    }
    
    if(vviDP[0][m] == 0){
        cout << -1 << endl;
        return 0;
    }
  
    vector<ll> viAns;
    ll nSum = 0;
    ll nLast = -1;
    for(ll i = 0; i < n; i++){
        ll nThis = -1;
        ll p = 1e9;
        for(ll j = nLast+1; j < n; j++){
            if(vviDP[j][m-nSum] == 2 && viP[j] < p){
                p = viP[j];
                nThis = j;
            }
        }
        if(nThis == -1){
            continue;
        }
        viAns.push_back(nThis+1);
        nSum += viA[nThis];
        nLast = nThis;
    }
    
    cout << viAns.size() << endl;
    for(ll i = 0; i < viAns.size(); i++){
        cout << viAns[i] << " ";
    }
    cout << endl;
    return 0;
}