divide this ['a', 'b', 'c', '1', '2', '3','4', '5', '6'] evenly into three separate list

l = ['a', 'b', 'c', '1', '2', '3','4', '5', '6']

def split(l, num_of_groups):
    return [l[i::num_of_groups] for i in range(num_of_groups)]
    
split(l,3)