/* -*- coding: utf-8 -*-
 *
 * 2803.cc:  No.2803 Bocching Star - yukicoder
 */

#include<cstdio>
#include<algorithm>
#include<utility>

using namespace std;

/* constant */

const int MAX_N = 200000;

/* typedef */

using pii = pair<int,int>;

/* global variables */

int ps[MAX_N], as[MAX_N];
pii pis[MAX_N];

/* subroutines */

/* main */

int main() {
  int n, s;
  scanf("%d%d", &n, &s);
  for (int i = 0; i < n; i++) scanf("%d", ps + i);

  for (int i = 0; i < n; i++) pis[i] = {ps[i], i};
  sort(pis, pis + n);

  int m = 0;
  for (int i = 0; i < n; i++)
    if ((i == 0 || pis[i - 1].first + s < pis[i].first) &&
	(i == n - 1 || pis[i].first + s < pis[i + 1].first))
      as[m++] = pis[i].second;
  sort(as, as + m);

  printf("%d\n", m);
  for (int i = 0; i < m; i++)
    printf("%d%c", as[i] + 1, (i + 1 < m) ? ' ' : '\n');
  
  return 0;
}