import numpy as np

def ddd(prev):
    if prev == -6:
        return 2
    if prev == -3:
        return 3
    if prev == 7:
        return 1
    a = np.random.random_sample(1)
    if a < 0.25:
        return 0
    elif a < 0.5:
        return 1
    elif a < 0.75:
        return 2
    else:
        return 3