#include <iostream>
#include <vector>
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    int a[2003], p[2003];
    for(int i = 0; i < n; i++) cin >> a[i];
    for(int i = 0; i < n; i++){
        cin >> p[i];
        p[i]--;
    }
    vector<int> dp[2003];
    vector<int> ans[2003];
    for(int i = 1; i <= m; i++) dp[i] = {n};
    for(int i = 0; i < n; i++){
        for(int j = m; j >= a[i]; j--){
            vector<int> v = dp[j - a[i]];
            v.push_back(p[i]);
            if(dp[j] > v){
                dp[j] = v;
                ans[j] = ans[j - a[i]];
                ans[j].push_back(i);
            }
        }
    }
    if(ans[m].size()){
        cout << ans[m].size() << endl;
        for(int i : ans[m]) cout << i + 1 << " ";
        cout << endl;
    }
    else{
        cout << -1 << endl;
    }
}