#include<bits/stdc++.h>
using namespace std;
#define int long long
signed main() {
	int n,s;
	cin >> n >> s;
	vector<pair<int,int>> a(n+2);
	for(int i = 0; i < n; i++) {
		int x;
		cin >> x;
		a[i] = {x,i+1};
	}
	a[n] = {-1e18,0};
	a[n+1] = {1e18,n+1};
	sort(a.begin(),a.end());
	vector<int> ans;
	for(int i = 1; i <= n; i++) {
		if(a[i].first > a[i-1].first+s && a[i].first < a[i+1].first-s) ans.push_back(a[i].second);
	}
	sort(ans.begin(),ans.end());
	n = ans.size();
	cout << n << endl;
	for(int i = 0; i < n; i++) cout << ans[i] << ' ';
}