Write function alternateCase which switch every letter in string from upper to lower and from lower to upper.
E.g: Hello World -> hELLO wORLD

```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 = 'def alternateCase(s):\n    \'\'\'\nSalvador Dali - The Persistence of Memory\n      ;!>,!!!>\n      <! ;!!!`\n      !! `!!!.\n      !!`,!!!>\n      !! !!!!!\n     ;!! !!!!!\n     `!! !!!!!\n      !! !!!!!>                           .\n      `!.`!!!!!                        ;<!`\n       !! `!!!!                     ,<!``\n       `!> !!!!                   ;<!`\n       <!! !!!!>                ;!``\n       !!! `!!!!               !!`                                    ,c,\n       !!!> !!!!>             ;`<             ,cc$$cc            .,r== $$c !\n       !!!! !!!!!!.        ,<!` !!!!!>>>;;;;;;;;.`"?$$c MMMMMMM )MM ,= "$$.`\n       <!!> !!!!!!!!!!!!!>`` ,>````  ``````````!!!; ?$$c`MMMMMM.`MMMP== `$h\n       `!! ;!!!!!!````.,;;;```          JF !;;;,,,,; 3$$.`MMMMMb MMMnnnM $$h\n       ;!! <!!!!.;;!!!```               JF.!!!!!!!!!>`$$h `MMMMM MMMMMMM $$$\n       ;!!>`!!!!!!``                    ?> !!!!!!!!!> $$$  MMMMM MMMMMMM $$$\n       <!! ;!!!!`                       `h !!!!!!!!!! $$$ MMMMMM MMMM" M $$$\n       `!>`!!!!                          b !!!!!!!!!! $$$ MMMMMM MMML,,`,$$$\n,,,,,, ;! <!!!> ,,,,,,,,,,,,,,,,         $ !!!!!!!!!! $$$ MMMMMM MMMMML J$$F\n!!!!!! !! !!!! `!!!!!!!!!!!!!!` ;        $ !!!!!!!!!! $$$ MMMMMP.MMMMMP $$$F\n!!!!! ;!! !!!!> !!!!!!!!!!!!` ;` .`.`.`. ?.`!!!!!!!!! 3$$  MMMP `MMMMM>,$$P\n!!!!` !!` !!!!> !!!!!!!!!!` ;!` `.`.`.`. `h !!!!!!!!! $$$  MMML  MMPPP J$$`.\n!!!! !!!;!!!!!`;!!!!!!!!` ;!`  .`.`.`.`.` ?,`!!!!!!!! ?$$ MMMMM.,MM_"`,$$F .\n!!!`;!!!.!!!!` <!!!!!!!` ;`  .`.`.`.`.`.`. ? `!!!!!!!>`$$ MMMMMbdML ` $$$  .\n``` !!!> !!!! ```````` ;!  .`.`.`.`.`.`.`.` h `!!!!!!> $$ )MMMMMMMMM d$$` `.\n!!` !!!``!!! <!!!!!!!> ` .`.`.`.`.`.`.`.`.` `?,``!!!!! ?$h 4MMMMMMP z$$` .`.\n`` <!!! !!!> ````````  .`.`.`.`.`.`.`.`.`.`.` ?h.````..`$$  MMMMMM ,$$F `.`.\n` !!!! <!!!.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`. `"??$F". `$h.`MMMMM $$$`.`.`.\n <!`! .!!!!> .`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`. cccc  `$$.`4MMP.3$F .`.`.\n<!``! !!!!!> .`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`. J$$$$$F . "$h." . 3$h .`.`.\n!` ! !!!!!!> .`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.  """" .`.`.`$$, 4 3$$ .`.`.\n ;! !!!!!!! `.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.  ?$h  J$F .`.`.\n;`  !!!!!!! `.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`. "$$$$P` .`.`.\n`  <!!!!!!! `.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`. . .`.`.`.`.\n,` !!!!!!! .`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.`.\n!! !!!!!!`,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,  `.`.`.`.\n!! !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!`  `.`.`.`.\n!! <!!!!`;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ;! `.`.`.`.\n!! ;!!!!>`!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!` <!! `.`.`.`.\n`,,!!!!``.;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!` <!!! `.`.`.`.\n`````.,;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!` <!!!! `.`.`.`.\n;!!!!!!!!!!!!!!!!!!!!!!!>>>````````````````````<!!!!!!!!!!!` !!!!!! `.`.`.`.\n!!!!!!!!!!!!!!!!!!````_,,uunmnmnmdddPPPPPPbbbnmnyy,_`````!  !!!!!!! `.`.`.`.\n!!!!!!!!!``_``!``,nmMMPP"""`,.,ccccccr==pccccc,,..`""444n,.`<!!!!!! `.`.`.`.\n!!!!!!!` ,dMM ,nMMP"",zcd$h.`$$$$$$$$L c  $$$$$$$$$$??cc`4Mn <!!!!! `.`.`.`.\n!!!!!! ,MMMP uMMP ,d$$$$$$$$cd$F ??$$$$$cd$$$$$$$$$F, ??h.`Mx !!!!! `.`.`.`.\n!!!!!! MMMP uMM",F,c ".$$$$$$$P`   ?$$$$$$$$$$$$$$$$C`,J$$.`M.`!!!! `.`.`.`.\n!!!``  MMM 4MMM L`"=-z$$P".,,.    ,c$$$$$$$$$$$$$$$$$$$$$$$ ML !!!! `.`.`.`.\n!!!.   `"" MMMM `$$hc$$$L,c,.,czc$$$$$$$$$$$$$$$$$$$$$$$$$$.4M `!!! `.`.`.`.\n!!!!;;;..  `MMMb ?$$$$$$??""""?????????????????? ;.`$$$$$$$`JM`,!!! `.`.`.`.\n!!!!!!!!!>  4MMMb."?$$$cc,.. .,,cccccccccccccccc,c`.$$$$$$$ MM <!!! `.`.`.`.\n!!!!!!!!!!  `MMMMMb,."??$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$?$$$ MM ;!!! `.`.`.`.\n!!!!!!!!!!    "4MMMMMMmn,."""???$$$$$$$$$$$$$$$$$$ $$$" ?$$ MP !!!! `.`.`.`.\n!!!!!!!!!!!;.   "4MMMMMMMMMMMmnmn,.`"""?????$$$$$$ ?$$  `CF.M> !!!! `.`.`.`.\n!!!!!!!!!!!!!!;.   `""44MMMMMMMMMMMMMMMMnnnn. ?$$$.<$$$h.$h MM !!!! `.`.`.`.\n!!!!!!!!!!!!!!!!>.;.      `""444MMMMMMMMMMMMMb $$$:<$$$$$$$ 4M <!!! `.`.`.`.\n!!!!!!!!!!!!!!!!!!!!!;<;);>;.     ..""""44MMMM J$`  <$$$$$$h`Mb`!!! `.`.`.`.\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!>;      `MMM ?$.  d$$$$$$$ MM.`!! `.`.`.`.\n!!!!!!!!!!```!``` ..``<!!!!!!!!!!!!!!!; .  MMM.<$$ <$$$$$$$$ 4Mb !! `.`.`.`.\n!`````````..    ;MMMMnn.`!!!!!!!!!!!!!!! ; MMM J$$hJ$$$$$$$$h`MM !! `.`.`.`.\n,xmdMMMbnmx,.    MMMMMMMr !!!!!!!!!!!!` ;: MMM $$$$$$$$$$??$$ MM !! `.`.`.`.\nP"`.,,,,c`""4MMn  MMMMMMx !!!!!!!!!!!` <!: MMM $$$$$$$$L =c$F.MP !! `.`.`.`.\nub "P4MM")M,x,"4b,`44MMMP !!!!!!!!!!  !!!: MMM ???$$$$$$"=,$ JM`;!! `.`.`.`.\nML,,nn4Mx`"MMMx.`ML ;,,,;<!!!!!!!!! ;!!!!: MMM.-=,$$$$$$hc$`.MP !!! `.`.`.`.\n. MMM   4Mx`MMML MM,`<!!!!!!!!!!!! ;!!!!!` `MMb  d$$$$$$$$` MM`,!!! `.`.`.`.\n,d" MMn. .,nMMMM MMM `!!!!!!!!!!! ;!!!!!!>  4MMb `$$$$$$$`.dM`.!!!! `.`.`.`.\n.`"M"_" MMMMMMMP,MMM ;!>>!!!!!!` <!!!!!!!!!. "MMb $$$$$$$ dM ;!!!!! `.`.`.`.\n `nr;MMMMM"MMMP dMM` >>!(!)<<!  <!!!!!!!!!!!. `MM.`$$$$$$ MM !!!!!! `.`.`.`.\n",Jn,"". ,uMMP dMMP /)<;>><>` .!!!!!!!!!!!!!!; `Mb $$$$$F;MP !!!!!! `.`.`.`.\n dPPM 4MMMMM" dMMP (->;)<><` ;!!!!!!!!!!!!!!!!. 4M $$$$$h M>.!!!!!! `.`.`.`.\n=M uMMnMMM" uMMM" <!;/;->;` ;!!!!!!!!!!!!!!!!!; 4M.??"$$`,M <!!!!!! `.`.`.`.\nJM )MMMM" uMMMM`,!>;`(>!>` <!!!!!!!!!!!!!!!!!!! 4M> -??`,M` !!!!!!! `.`.`.`.\nMM `MP" xdMMMP <(;<:)!`)` <!!!!!!!!!!!!!!!!!!!! MMb  - ,M`;!!!!!!!` `.`.`.`.\nMP   ,nMMMMP" (>:)/;<:!  !!!!!!!!!!!!!!!!!!!!!! `MM.-= d`;!!!!!!!! .`.`.`.`.\n,xndMMMMP" .;)`;:`>(;:  !!!!!!!!!!!!!!!!!!!!!!!; 4MMnndM <!!!!!!!  .`.`.`.`.\nMMMMMP" .;(:`-;(.><(` ;!!!!!!!!!!!!!!!!!!!!!!!!!, 4MMMMP !!!!!!!> `.`.`.`.`.\nP"" .,;<):(;/(\\`>-)` ;!!!!!!!!!!!!!!!!!!!!!!!!!!!>.`"P" <!!!!!!! .`.`.`.`.`.\n,<;),<-:><;,<- >;>` ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!;;<!!!!!!!!  .`.`.`.`.`.\n)-/;`<:<;\\->:(`;(` ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!` `.`.`.`.`.`.\n:\\;`<(.:>-;(;<>:  <!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! .`.`.`.`.`.`.\n(.;>:`<;:<;-/)/  <!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  .`.`.`.`.`.`.\n;-;:>:.;`;(`;` ;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!` `.`.`.`.`.`.`.\n    \'\'\'\n    return s.swapcase()'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'alternateCase'
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: 5354