In this Kata, you will be given a string of numbers in sequence and your task will be to return the missing number. If there is no number
missing or there is an error in the sequence, return `-1`.

For example:
```Haskell
missing("123567") = 4 
missing("899091939495") = 92
missing("9899101102") = 100
missing("599600601602") = -1 -- no number missing
missing("8990919395") = -1 -- error in sequence. Both 92 and 94 missing.
```
The sequence will always be in ascending order.

More examples in the test cases. 

Good luck!

```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 missing(s):\n    result = -1\n    for start_chunk in range(1,len(s)//2 +1):\n        res = inner(s,start_chunk)\n        if res != -1:\n            result = res\n    return result\n\ndef inner(s,start_chunk):\n    result = -1\n    nums = []\n    rest = s\n    rip_count = 0\n    last = int(rest[:start_chunk])\n    rest = rest[start_chunk:]\n    nums.append(last)\n    chunk = start_chunk\n    while rest!= '':\n        if int(rest[:chunk]) - last != 1:\n            if int(rest[:chunk+1]) - last == 1:\n                chunk +=1\n                print('chunk +=1')\n            elif int(rest[:chunk+1]) - last == 2:\n                chunk +=1\n                rip_count+=1\n                print('chunk +=1')\n                print('rip_count+=1')\n                result = last + 1\n            elif int(rest[:chunk]) - last  == 2:\n                rip_count+=1\n                print('rip_count+=1')\n                result = last + 1\n            else: return -1\n        nums.append(int(rest[:chunk]))\n        last = int(rest[:chunk])\n        rest = rest[chunk:]\n        print(nums)\n        if(rip_count)>1:\n            return -1\n    return result"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'missing'
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: 6995