#include<bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using mint=modint998244353; //1000000007;
using ll=long long;
using pp=pair<int,int>;
#define sr string 
#define vc vector
#define fi first
#define se second
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define pb push_back
#define all(v) v.begin(),v.end()
#define pque priority_queue
#define bpc(a) __builtin_popcount(a)
int main(){
  int n,m;cin>>n>>m;
  vc<int>v(n); rep(i,n)cin>>v[i];
  vc<int>p(n); rep(i,n)cin>>p[i]; rep(i,n)p[i]--;
  vc<int>r(n); rep(i,n)r[p[i]]=i;
  vc dp(n+1,vc<int>(m+1,0)); dp[n][0]=1;
  for(int i=n-1;i>=0;i--)rep(j,m+1)if(dp[i+1][j]){
    dp[i][j]=1;
    if(j+v[i]<=m)dp[i][j+v[i]]=1;
  }
  vc<int>ans; int last=-1; int now=m; 
  if(!dp[0][m]){
    cout<<-1;
    return 0;
  }
  while(now>0){
    rep(i,n){
      int x=r[i];
      if(x<=last)continue;
      if(v[x]>now||!dp[x+1][now-v[x]])continue;
      ans.pb(x);
      last=x; now-=v[x];
      break;
    }
  }
  cout<<ans.size()<<"\n";
  for(auto au:ans)cout<<au+1<<' ';
}