Given a number, write a function to output its reverse digits.  (e.g. given 123 the answer is 321)


Numbers should preserve their sign; i.e. a negative number should still be negative when reversed.

### Examples
```
 123 ->  321
-456 -> -654
1000 ->    1
```

```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 reverse_number(n):\n    \n    digits = 0\n    num = 0\n    if(n >= 0):\n      num = n\n      sign_n = 1\n    else:\n      num = -n\n      sign_n = -1\n    \n    # while loop to count the number of digits, stored in digits\n    while(num >= 1):\n        num /= 10\n        digits += 1\n    \n    # Debugging print statement\n    # print("digits = " , digits)\n    \n    # Make n a positive number\n    n = n * sign_n\n\n    # for loop to store the digits of the positive part of n, strored as strings\n    l_direct = list()\n    for i in range(0,digits):\n        l_direct.append(str(n % 10))\n        n = int(n/10)\n        #print(n)\n        i += 1\n        \n    # Concatenate the elements of the list into a string\n    s = ""\n    for j in range(0, digits):\n      s = s + l_direct[j]  \n    \n    # We need to account for the case of an empty string, otherwise python will complain if we try \n    # to convert an empty string to an integer\n    if(s == \'\'):\n        result = 0\n    else:\n        # restore the original sign of n\n        result = int(s) * sign_n\n        \n    return result'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'reverse_number'
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: 5744