#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
  int n,m; cin >> n >> m; vector<int> dp(m+1); vector<vector<int>> rc(m+1);
  vector<int> A(n),B(n);
  for (int& a:A) cin >> a;
  for (int& a:B) cin >> a;
  for (int i(n-1);i > -1;--i) for (int k(m);k >= B[i];--k) if (dp[k]<dp[k-B[i]]+A[i]){
    dp[k] = dp[k-B[i]]+A[i],rc[k] = rc[k-B[i]],rc[k].emplace_back(i+1);
  }
  cout << rc[m].size() << endl; reverse(rc[m].begin(),rc[m].end());
  for (int a:rc[m]) cout << a << ' ';
  cout << endl;
}