N, S = map(int, input().split())
P = list(map(int, input().split()))
inf = 10 ** 18
L = [(-inf, 0)]
for i in range(N):
    L.append((P[i], i + 1))
L.append((inf, N + 1))
L.sort()
ans = []
for i in range(1, N + 1):
    if abs(L[i][0] - L[i-1][0]) > S and abs(L[i][0] - L[i+1][0]) > S:
        ans.append(L[i][1])
        
ans.sort()
print(len(ans))
print(*ans)