#pragma GCC optimize("Ofast")
#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <queue>
#include <cstdio>
#include <ctime>
#include <assert.h>
#include <chrono>
#include <random>
#include <numeric>
#include <set>
#include <deque>
#include <stack>
#include <sstream>
#include <utility>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <tuple>
#include <array>
#include <bitset>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}
inline ll time() {
    return static_cast<long double>(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()) * 1e-9;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int n,m; cin >> n >> m;
    vector<int> a(n),p(n);
    vector<int> v;
    for(int i=0;i<n;i++){
        cin >> a[i];
    }
    for(int i=0;i<n;i++){
        cin >> p[i];
    }
    vector<int> id(n);
    for(int i=0;i<n;i++){
        id[i] = i;
    }
    sort(id.begin(), id.end(), [&](auto i,auto j){
        return p[i] < p[j];
    });
    for(int _=0;_<n and m;_++){
        for(int _i=0;_i<n;_i++){
            int i = id[_i];
            if(m < a[i]) continue;
            if(v.size() and v.back() >= i) continue;
            bitset<2001> bs;
            bs[0] = 1;
            for(int j=i+1;j<n;j++){
                bs |= (bs<<a[j]);
            }
            if(bs[m-a[i]]){
                m -= a[i];
                v.push_back(i);
                break;
            }
        }
    }
    if(v.size() == 0){
        cout << -1 << endl;
    }
    else{
        cout << v.size() << endl;
        for(int i:v){
            cout << i+1 << " ";
        }
        cout << endl;
    }
}