[BasE91](http://base91.sourceforge.net/) is a method for encoding binary as ASCII characters. It is more efficient than Base64 and needs 91 characters to represent the encoded data.

The following ASCII charakters are used:

    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
    '!#$%&()*+,./:;<=>?@[]^_`{|}~"'
    
Create two functions that encode strings to basE91 string and decodes the other way round. 

    b91encode('test') = 'fPNKd'
    b91decode('fPNKd') = 'test'
    
    b91decode('>OwJh>Io0Tv!8PE') = 'Hello World!'
    b91encode('Hello World!') = '>OwJh>Io0Tv!8PE'
    
Input strings are valid.

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'import struct\n\nbase91_alphabet = [\'A\', \'B\', \'C\', \'D\', \'E\', \'F\', \'G\', \'H\', \'I\', \'J\', \'K\', \'L\', \'M\',\n    \'N\', \'O\', \'P\', \'Q\', \'R\', \'S\', \'T\', \'U\', \'V\', \'W\', \'X\', \'Y\', \'Z\',\n    \'a\', \'b\', \'c\', \'d\', \'e\', \'f\', \'g\', \'h\', \'i\', \'j\', \'k\', \'l\', \'m\',\n    \'n\', \'o\', \'p\', \'q\', \'r\', \'s\', \'t\', \'u\', \'v\', \'w\', \'x\', \'y\', \'z\',\n    \'0\', \'1\', \'2\', \'3\', \'4\', \'5\', \'6\', \'7\', \'8\', \'9\', \'!\', \'#\', \'$\',\n    \'%\', \'&\', \'(\', \')\', \'*\', \'+\', \',\', \'.\', \'/\', \':\', \';\', \'<\', \'=\',\n    \'>\', \'?\', \'@\', \'[\', \']\', \'^\', \'_\', \'`\', \'{\', \'|\', \'}\', \'~\', \'"\']\n\ndecode_table = dict((v,k) for k,v in enumerate(base91_alphabet))\n\n\ndef b91decode(encoded_str):\n    v = -1\n    b = 0\n    n = 0\n    out = bytearray()\n    for strletter in encoded_str:\n        if not strletter in decode_table:\n            continue\n        c = decode_table[strletter]\n        if(v < 0):\n            v = c\n        else:\n            v += c*91\n            b |= v << n\n            n += 13 if (v & 8191)>88 else 14\n            while True:\n                out += struct.pack(\'B\', b&255)\n                b >>= 8\n                n -= 8\n                if not n>7:\n                    break\n            v = -1\n    if v+1:\n        out += struct.pack(\'B\', (b | v << n) & 255 )\n    return out.decode()\n\n\ndef b91encode(string):\n    b = 0\n    n = 0\n    out = \'\'\n    bindata = string.encode()\n    for count in range(len(bindata)):\n        byte = bindata[count:count+1]\n        b |= struct.unpack(\'B\', byte)[0] << n\n        n += 8\n        if n>13:\n            v = b & 8191\n            if v > 88:\n                b >>= 13\n                n -= 13\n            else:\n                v = b & 16383\n                b >>= 14\n                n -= 14\n            out += base91_alphabet[v % 91] + base91_alphabet[v // 91]\n    if n:\n        out += base91_alphabet[b % 91]\n        if n>7 or b>90:\n            out += base91_alphabet[b // 91]\n    return out'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'b91decode'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 6025