n,s=map(int,input().split())
P=list(map(int,input().split()))
Pi=[]
for i,j in enumerate(P):
    Pi.append((j,i+1))
Pi.sort()
ans=[]
for i in range(n):
    f=0
    for j in range(-1,2,2):
        if 0<=i+j<n:
            if abs(Pi[i][0]-Pi[i+j][0])<=s:
                f=1
    if f==0:
        ans.append(Pi[i][1])
ans.sort()
print(len(ans))
print(*ans)