http://puzzling.stackexchange.com/questions/38351/how-to-decrypt-these-words

weird_encoding.py

def weird_encoding(s):
    assert(isinstance(s, str))
    first = list(s[::-1])
    for i, c in enumerate(s):
        if c.isupper():
            first[i] = first[i].upper()
        elif c.islower():
            first[i] = first[i].lower()
    first = ''.join(first)
    second = str(len(s))
    tmp = ''
    for c in s:
        if c.isdigit():
            tmp += str(int(c) + 1)
            continue
        elif c in ('z', 'Z'):
            tmp += 'a'
            continue
        tmp += chr(ord(c) + 1)
    if s.isdigit():
        third = tmp[::-1]
    elif s[-1].isupper():
        third = tmp.lower()[::-1]
    else:
        third = tmp.upper()[::-1]
    return first + second + third


if __name__ == '__main__':
    print(weird_encoding('Hello'))
    print(weird_encoding('LoL'))
    print(weird_encoding('123'))