[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 = 'b91_enctab = [\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    \'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]\n\n\ndef b91decode(strng):\n    decode_str = ""\n    value = -1\n    seek = 0\n    bynary = 0\n\n    for item in strng:\n        code = b91_enctab.index(item)\n        if value < 0:\n            value = code\n        else:\n            value += code * 91\n            bynary |= value << seek\n\n            if value & 8191 > 88:\n                seek += 13\n            else:\n                seek += 14\n\n            while seek > 7:\n                decode_str += chr(bynary & 255)\n                bynary >>= 8\n                seek -= 8\n            value = -1\n    if value + 1:\n        decode_str += chr((bynary | value << seek) & 255)\n    return decode_str\n\n\ndef b91encode(strng):\n    encode_str = \'\'\n    bynary = 0\n    seek = 0\n    for symb in strng:\n        bynary |= ord(symb) << seek\n        seek += 8\n        if seek > 13:\n            value = bynary & 8191\n\n            if value <= 88:\n                value = bynary & 16383\n                bynary >>= 14\n                seek -= 14\n            else:\n                bynary >>= 13\n                seek -= 13\n\n            encode_str += b91_enctab[value % 91] + b91_enctab[value // 91]\n\n    if seek != 0:\n        encode_str += b91_enctab[bynary % 91]\n        if seek > 7 or bynary > 90:\n            encode_str += b91_enctab[bynary // 91]\n\n    return encode_str\n\n\na = """<txG@<^F#H~H8MxsCYDpde4_SW"yER~]JwO_!g|OcxW$1^:KNRedl$r6l/:=JsiD+[R]bKVws=Op!v"?%9|Tn<7@,{q;r>d:sZH)"""\n\n\nr = """4J>StI@i5oLyF.Th)8=+!tB9!#/`l$e$+Kz<}c6~%DsV@(rcJJ>yZ=?Y3JU@7bjoME3J<b5*KN.6xTP6zT1B1Zpc%nVRQxp1|+Zh|4@53d">!|$7+)vwUl:>cK"""\n\n\na = \'\'\'4J>StI@i5oLyF.Th)8=+!tB9!#/`l$e$+Kz<}c6~%DsV@(rcJJ>yZ=?Y3JU@7bjoME3J<b5*KN.6xTP6zT1B1Zpc%nVRQxp1|+Zh|4@53d">!|$7+)vwUl:>cK\'\'\'\n\nprint((b91encode(\'<txG@<^F#H~H8MxsCYDpde4_SW"yER~]JwO_!g|OcxW$1^:KNRedl$r6l/:=JsiD+[R]bKVws=Op!v"?%9|Tn<7@,{q;r>d:sZH)\')))\n\nprint((r == b91encode(a)))\n\n'
_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: 5641