Create a function that interprets code in the esoteric language **Poohbear**

## The Language

Poohbear is a stack-based language largely inspired by Brainfuck. It has a maximum integer value of 255, and 30,000 cells. The original intention of Poohbear was to be able to send messages that would, to most, be completely indecipherable: 
Poohbear Wiki

* For the purposes of this kata, you will make a version of Poohbear that has **infinite** memory cells in **both directions** (so you do not need to limit cells to 30,000)
* Cells have a default value of 0
* Each cell can hold one byte of data.  Once a cell's value goes above 255, it wraps around to 0.  If a cell's value goes below 0, it wraps to 255.
* If the result of an operation isn't an int, round the result down to the nearest one.
* Your interpreter should ignore any non-command characters in the code.
* If you come to a `W` in the code and the current cell is equal to 0, jump to the corresponding `E`.
* If you come to an `E` in the code and the current cell is **not** 0, jump back to the corresponding `W`.

Here are the Poohbear commands: 

| Command | Definition
|---| -------------------------
| + | Add 1 to the current cell
| - | Subtract 1 from the current cell
| > | Move the cell pointer 1 space to the right
| < | Move the cell pointer 1 space to the left
| c | "Copy" the current cell
| p | Paste the "copied" cell into the current cell
| W | While loop - While the current cell is not equal to 0
| E | Closing character for loops
| P | Output the current cell's value as ascii
| N | Output the current cell's value as an integer
| T | Multiply the current cell by 2
| Q | Square the current cell
| U | Square root the current cell's value
| L | Add 2 to the current cell
| I | Subtract 2 from the current cell
| V | Divide the current cell by 2
| A | Add the copied value to the current cell's value
| B | Subtract the copied value from the current cell's value
| Y | Multiply the current cell's value by the copied value
| D | Divide the current cell's value by the copied value.

```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 poohbear(s):\n    st=[]\n    loops=[]\n    for i,c in enumerate(s):\n        if c=='W':\n            st.append(i)\n        elif c=='E':\n            loops.append((st.pop(),i))\n    cells=[0]\n    p=0\n    m=0\n    i=0\n    output=''\n    while(i<len(s)):\n        c=s[i]\n        if c=='+':\n            cells[p]=(cells[p]+1)%256\n        elif c=='-':\n            cells[p]=(cells[p]-1)%256\n        elif c=='>':\n            p+=1\n            if p==len(cells):\n                cells.append(0)\n        elif c=='<':\n            if p==0:\n                cells.insert(0,0)\n            else:\n                p-=1\n        elif c=='c':\n            m=cells[p]\n        elif c=='p':\n            cells[p]=m\n        elif c=='W':\n            if cells[p]==0:\n                for w,e in loops:\n                    if i==w:\n                        i=e\n                        break\n        elif c=='E':\n            if cells[p]!=0:\n                for w,e in loops:\n                    if i==e:\n                        i=w\n                        break\n        elif c=='P':\n            output+=chr(cells[p])\n        elif c=='N':\n            output+=str(cells[p])\n        elif c=='T':\n            cells[p]=(cells[p]*2)%256\n        elif c=='Q':\n            cells[p]=(cells[p]**2)%256\n        elif c=='U':\n            cells[p]=(int(cells[p]**0.5))%256\n        elif c=='L':\n            cells[p]=(cells[p]+2)%256\n        elif c=='I':\n            cells[p]=(cells[p]-2)%256\n        elif c=='V':\n            cells[p]=(cells[p]//2)%256\n        elif c=='A':\n            cells[p]=(cells[p]+m)%256\n        elif c=='B':\n            cells[p]=(cells[p]-m)%256\n        elif c=='Y':\n            cells[p]=(cells[p]*m)%256\n        elif c=='D':\n            cells[p]=(cells[p]//m)%256\n        i+=1\n    return output"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'poohbear'
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: 6931