import string

LOWER = ['_', '.']
UPPER = ['|', ' ']

def split_it(s):
    s_lower = ""
    s_upper = ""

    for i in range(len(s)):
        if s[i] in string.ascii_lowercase or s[i] in LOWER:
            s_lower += s[i]
        if s[i] in string.ascii_uppercase or s[i] in UPPER:
            s_upper += s[i]

    (l, u) = s_lower, s_upper
    return (l,u)

def split_rec(s):
    if len(s) == 0:
        return "" , ""
    (l, u) = split_rec(s[1:])
    if s[0] in string.ascii_lowercase or s[0] in LOWER:
        return (s[0] + l, u)
    if s[0] in string.ascii_uppercase  or s[0] in UPPER:
        return (l, s[0] + u)
    return (l, u)