#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i,a,b) for(it i=(it)(a);i<=(it)b;i++)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define moda 998244353LL
#define modb 1000000007LL
#define dai 2500000000000000000LL
#define sho -dai
#define eps 1e-14
using it=long long;
using un=unsigned long long;
using db=long double;
using st=string;
using ch=char;
using bo=bool;
using P=pair<it,it>;
using T=tuple<it,it,it>;
using vi=vector<it>;
using vd=vector<db>;
using vs=vector<st>;
using vc=vector<ch>;
using vb=vector<bo>;
using vp=vector<P>;
using sp=set<P>;
using ss=set<st>;
using si=set<it>;
using vvi=vector<vi>;
using vvs=vector<vs>;
using vvb=vector<vb>;
using vvc=vector<vc>;
using vvp=vector<vp>;
using vsi=vector<si>;
using vsp=vector<sp>;
using vvsi=vector<vsi>;
using vvsp=vector<vsp>;
using vvvi=vector<vvi>;
using vvvvi=vector<vvvi>;
const it dx[4]={0,1,0,-1};
const it dy[4]={1,0,-1,0};

it lod(vi &a,it k){
  auto d=lower_bound(all(a),k);
  it e=distance(a.begin(),d);
  return e;
}

int main() {
  it n,s;cin>>n>>s;
  vp p(n);vi a(n),ko;
  rep(i,0,n-1)cin>>p[i].first;
  rep(i,0,n-1)p[i].second=i;
  sort(all(p));
  rep(i,0,n-1)a[i]=p[i].first;
  rep(i,0,n-1){
    it e=lod(a,a[i]+s+1)-1,f=lod(a,a[i]-s);
    if(e-f==0)ko.push_back(p[i].second);
  }
  cout<<ko.size()<<endl;
  sort(all(ko));
  for(it i:ko)cout<<i+1<<" ";
  cout<<endl;
}