N,S=map(int,input().split())
P=list(map(int,input().split()))
p=[(P[i],i+1) for i in range(N)]+[(-(1<<60),-1),(1<<60,-1)]
p.sort()
ans=[]
for i in range(1,N+1):
	near=min(p[i][0]-p[i-1][0],p[i+1][0]-p[i][0])
	if near>S:
		ans.append(p[i][1])
ans.sort()
print(len(ans))
print(*ans)