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 = 'from collections import defaultdict\ndef poohbear(code):\n    stack = []\n    while_loop = {}\n    for i,c in enumerate(code):\n        if c == \'W\':\n            stack.append(i)\n        elif c == \'E\':\n            while_loop[i] = stack[-1]\n            while_loop[stack.pop()] = i\n\n    memory = defaultdict(int)\n    code_pointer = 0\n    cur_m = 0\n    output = []\n    copied_value = None\n\n    while code_pointer < len(code):\n        cmd = code[code_pointer]\n        if cmd == \'+\':      memory[cur_m] = (memory[cur_m] + 1) % 256\n        elif cmd == \'-\':    memory[cur_m] = (memory[cur_m] - 1) % 256\n        elif cmd == \'>\':    cur_m += 1\n        elif cmd == \'<\':    cur_m -= 1\n        elif cmd == \'c\':    copied_value = memory[cur_m]\n        elif cmd == \'p\':    memory[cur_m] = copied_value # ??? NONE?\n        elif cmd == \'W\':    code_pointer = while_loop[code_pointer] if memory[cur_m] == 0 else code_pointer\n        elif cmd == \'E\':    code_pointer = while_loop[code_pointer] if memory[cur_m] != 0 else code_pointer\n        elif cmd == \'P\':    output.append(chr(memory[cur_m]))\n        elif cmd == \'N\':    output.append(str(memory[cur_m]))\n        elif cmd == \'T\':    memory[cur_m] = (memory[cur_m] * 2) % 256\n        elif cmd == \'Q\':    memory[cur_m] = (memory[cur_m] ** 2) % 256\n        elif cmd == \'U\':    memory[cur_m] = int(memory[cur_m] ** 0.5)\n        elif cmd == \'L\':    memory[cur_m] = (memory[cur_m] + 2) % 256\n        elif cmd == \'I\':    memory[cur_m] = (memory[cur_m] - 2) % 256\n        elif cmd == \'V\':    memory[cur_m] //= 2\n        elif cmd == \'A\':    memory[cur_m] = (memory[cur_m] + copied_value) % 256\n        elif cmd == \'B\':    memory[cur_m] = (memory[cur_m] - copied_value) % 256\n        elif cmd == \'Y\':    memory[cur_m] = (memory[cur_m] * copied_value) % 256\n        elif cmd == \'D\':    memory[cur_m] //= copied_value\n        code_pointer += 1\n    \n    return "".join(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: 6879