#include<bits/stdc++.h>
using namespace std;
using ll=long long;



int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N,X;
    cin>>N>>X;
    vector<int> V(N),W(N);
    for(int i=0;i<N;i++)cin>>V[i];
    for(int i=0;i<N;i++)cin>>W[i];
    vector<vector<ll>> dp(N+1,vector<ll>(X+1,-1e18));
    dp[N][0]=0;
    for(int i=N-1;i>=0;i--){
        for(int x=0;x<=X;x++){
            dp[i][x]=max(dp[i][x],dp[i+1][x]);
            if(x+W[i]<=X)dp[i][x+W[i]]=max(dp[i][x+W[i]],dp[i+1][x]+V[i]);
        }
    }
    ll x=-1,mx=-1;
    for(int w=0;w<=X;w++){
        if(mx<=dp[0][w]){
            mx=dp[0][w];
            x=w;
        }
    }
    vector<ll> AN;
    for(int i=0;i<N;i++){
        if(dp[i][x]==dp[i+1][x])continue;
        if(x>=W[i]&&dp[i+1][x-W[i]]==mx-V[i]){
            mx-=V[i];
            x-=W[i];
            AN.push_back(i+1);
        }
    }
    cout<<AN.size()<<"\n";
    for(int i=0;i<AN.size();i++)cout<<AN[i]<<" \n"[i==AN.size()-1];
}