N, S = map(int, input().split())
P = list(map(int, input().split()))
Z = [(P[i],i+1) for i in range(N)]
Z.append((-(1<<60),-1))
Z.append((1<<60,-1))
Z.sort(key = lambda x:x[0])

ans = []
for i in range(1,N+1):
    if Z[i][0] - Z[i-1][0] > S and Z[i+1][0] - Z[i][0] > S:
        ans.append(Z[i][1])

ans.sort()
print(len(ans))
print(*ans)