using System;
using System.Collections.Generic;
using System.Linq;

// No.3329 Only the Rightest Choice is Right!!!
// https://yukicoder.me/problems/no/3329
class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("4 5");
            WillReturn.Add("1 4 2 3");
            WillReturn.Add("1 4 2 3");
            //2
            //3 4
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("6 3000");
            WillReturn.Add("1 1 1 1 1 1");
            WillReturn.Add("3000 3000 3000 3000 3000 3000");
            //1
            //6
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("10 3000");
            WillReturn.Add("2992 3000 1 1 1 1 1 1 1 1");
            WillReturn.Add("2992 3000 1 1 1 1 1 1 1 1");
            //1
            //2
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static long[] GetSplitArr(string pStr)
    {
        return (pStr == "" ? new string[0] : pStr.Split(' ')).Select(pX => long.Parse(pX)).ToArray();
    }

    struct ItemInfoDef
    {
        internal long Value;
        internal long Weight;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        long[] wkArr = GetSplitArr(InputList[0]);
        long WeightLimit = wkArr[1];

        long[] ValueArr = GetSplitArr(InputList[1]);
        long[] WeightArr = GetSplitArr(InputList[2]);

        var ItemInfoList = new List<ItemInfoDef>();
        for (long I = 0; I <= ValueArr.GetUpperBound(0); I++) {
            ItemInfoDef WillAdd;
            WillAdd.Value = ValueArr[I];
            WillAdd.Weight = WeightArr[I];
            ItemInfoList.Add(WillAdd);
        }

        // 状態[重さ合計]なインラインDP表
        JyoutaiDef[] DPArr = new JyoutaiDef[WeightLimit + 1];
        var FirstJyoutai = new JyoutaiDef();
        FirstJyoutai.IndList = "";
        FirstJyoutai.Score = 0;
        DPArr[0] = FirstJyoutai;

        for (int I = 0; I <= ItemInfoList.Count - 1; I++) {
            for (long J = WeightLimit; 0 <= J; J--) {
                if (DPArr[J] == null) continue;

                long NewJ = J + ItemInfoList[I].Weight;
                if (NewJ > WeightLimit) continue;

                long NewScore = DPArr[J].Score + ItemInfoList[I].Value;
                string NewIndList = DPArr[J].IndList + I.ToString().PadLeft(4, '0');

                if (DPArr[NewJ] != null) {
                    if (DPArr[NewJ].Score > NewScore) {
                        continue;
                    }
                    if (DPArr[NewJ].Score == NewScore) {
                        int CompareResult = DPArr[NewJ].IndList.CompareTo(NewIndList);
                        if (CompareResult >= 0) {
                            continue;
                        }
                    }
                }
                var NewJyoutai = new JyoutaiDef();
                NewJyoutai.IndList = NewIndList;
                NewJyoutai.Score = NewScore;
                DPArr[NewJ] = NewJyoutai;
            }
        }

        var Query = DPArr.Where(pX => pX != null).OrderByDescending(pX => pX.Score).Select(pX => pX.IndList);
        string AnswerIndList = Query.First();
        var AnswerList = new List<long>();
        for (int I = 0; I <= AnswerIndList.Length - 1; I += 4) {
            long CurrVal = long.Parse(AnswerIndList.Substring(I, 4));
            AnswerList.Add(CurrVal + 1);
        }
        Console.WriteLine(AnswerList.Count);
        Console.WriteLine(LongEnumJoin(" ", AnswerList));
    }

    class JyoutaiDef
    {
        internal string IndList;
        internal long Score;
    }

    // セパレータとLong型の列挙を引数として、結合したstringを返す
    static string LongEnumJoin(string pSeparater, IEnumerable<long> pEnum)
    {
        string[] StrArr = Array.ConvertAll(pEnum.ToArray(), pX => pX.ToString());
        return string.Join(pSeparater, StrArr);
    }
}