We’ve all seen katas that ask for conversion from snake-case to camel-case, from camel-case to snake-case, or from camel-case to kebab-case — the possibilities are endless.

But if we don’t know the case our inputs are in, these are not very helpful.

### Task:

So the task here is to implement a function (called `id` in Ruby/Crystal/JavaScript/CoffeeScript and `case_id` in Python/C) that takes a string, `c_str`, and returns a string with the case the input is in. The possible case types are “kebab”, “camel”, and ”snake”. If none of the cases match with the input, or if there are no 'spaces' in the input (for example in snake case, spaces would be '_'s), return “none”. Inputs will only have letters (no numbers or special characters).

### Some definitions

Kebab case: `lowercase-words-separated-by-hyphens`

Camel case: `lowercaseFirstWordFollowedByCapitalizedWords`

Snake case: `lowercase_words_separated_by_underscores`

### Examples:

```python
case_id(“hello-world”) #=> “kebab”
case_id(“hello-to-the-world”) #=> “kebab”
case_id(“helloWorld”) #=> “camel”
case_id(“helloToTheWorld”) #=> “camel”
case_id(“hello_world”) #=> “snake”
case_id(“hello_to_the_world”) #=> “snake”
case_id(“hello__world”) #=> “none”
case_id(“hello_World”) #=> “none”
case_id(“helloworld”) #=> “none”
case_id(“hello-World”) #=> “none”
```

Also check out my other creations — [Split Without Loss](https://www.codewars.com/kata/split-without-loss), [Adding Fractions](https://www.codewars.com/kata/adding-fractions),
[Random Integers](https://www.codewars.com/kata/random-integers), [Implement String#transpose](https://www.codewars.com/kata/implement-string-number-transpose), [Implement Array#transpose!](https://www.codewars.com/kata/implement-array-number-transpose), [Arrays and Procs #1](https://www.codewars.com/kata/arrays-and-procs-number-1), and [Arrays and Procs #2](https://www.codewars.com/kata/arrays-and-procs-number-2)

```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 = "import re\n\ndef case_id(c_str):\n    if re.match(r'^([a-z]+\\-)+[a-z]+$', c_str):\n        return 'kebab'\n    if re.match(r'^([a-z]+\\_)+[a-z]+$', c_str):\n        return 'snake'\n    if re.match(r'^([a-z]+[A-Z])+[a-z]+$', c_str):\n        return 'camel'\n    return 'none'"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'case_id'
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: 38884