n,s=map(int,input().split())
P=list(map(int,input().split()))
P=[[p,i] for i,p in enumerate(P)]
P.sort()

if len(P)==1:
    print(1)
    print(1)
    exit()

ans=[]
for i in range(n):
    p=P[i][0]
    pp=P[i-1][0] if i>0 else -1<<60
    np=P[i+1][0] if i<n-1 else 1<<60
    if s<p-pp and s<np-p:
        ans.append(P[i][1]+1)
    

print(len(ans))       
print(*sorted(ans))