Write a function that takes a positive integer and returns the next smaller positive integer containing the same digits.

For example:

```python
next_smaller(21) == 12
next_smaller(531) == 513
next_smaller(2071) == 2017
```

Return -1 (for `Haskell`: return `Nothing`, for `Rust`: return `None`), when there is no smaller number that contains the same digits. Also return -1 when the next smaller number with the same digits would require the leading digit to be zero.

```python 
next_smaller(9) == -1
next_smaller(135) == -1
next_smaller(1027) == -1  # 0721 is out since we don't write numbers with leading zeros
```
```ruby 
next_smaller(9) == -1
next_smaller(135) == -1
next_smaller(1027) == -1  # 0721 is out since we don't write numbers with leading zeros
```

 * some tests will include very large numbers.
 * test data only employs positive integers.

*The function you write for this challenge is the inverse of this kata: "[Next bigger number with the same digits](http://www.codewars.com/kata/next-bigger-number-with-the-same-digits)."*

```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 operator import itemgetter\n\ndef next_smaller(n):\n    s        = str(n)\n    LR_Pairs = list(enumerate(zip(s,s[1:])))                                                    # Association pair (l,r) and index of left char of the pair\n    iP,pivot = next( ((i,l) for i,(l,r) in reversed(LR_Pairs) if l>r), (-1,-1) )                # Extract first increasing pair, coming from the end,...\n                                                                                                # ... then get the left char (pivot) and it's index\n    if iP == -1: return -1                                                                      # No smaller number...\n    \n    iM,mx = max( ((i,c) for i,c in enumerate(s[iP+1:],iP+1) if c < pivot), key=itemgetter(1))   # Highest char smaller than 'pivot' and its index\n    nextS = s[:iP] + mx + ''.join(sorted(s[iP:iM]+s[iM+1:], reverse=True))                      # Move 'mx' in place of 'pivot', then sort all the remaining chars, descending\n    \n    return int(nextS) if nextS[0] != '0' else -1"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'next_smaller'
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: 6837