n, s = map(int, input().split())
p = list(map(int, input().split()))

star = [0] * n
for i in range(n):
    star [i] = (p[i], i+1)

star.sort()

ans = []
for i in range(n):
    k, v = star[i]
    flag = True
    if i > 0:
        kk, vv = star[i-1]
        if abs(k - kk) <= s:
            flag = False
    if i < n - 1:
        kk, vv = star[i+1]
        if abs(k - kk) <= s:
            flag = False

    if flag:
        ans.append(v)

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