def front_c(r):
    rt = [12, 24, 36, 37, 38, 26, 14, 13]
    rotate(r, rt)
    L = [11, 23, 35, 45, 46, 47, 39, 27, 15, 8, 7, 6]
    return shift(r, L)
def front_c(r):
    rt = [12, 24, 36, 37, 38, 26, 14, 13]
    rotate(r, rt)
    L = [11, 23, 35, 45, 46, 47, 39, 27, 15, 8, 7, 6]
    return shift(r, L)