# -*- coding: utf-8 -*-
def split(l):
    nonneg = []
    neg = []
    for e in l:
        if e >= 0:
            nonneg.append(e)
        else:
            neg.append(e)
    return nonneg, neg

l = [-4, 12, 42, 0, -12, 14]
print split(l)