Note: This kata is inspired by [Convert a Number to a String!](http://www.codewars.com/kata/convert-a-number-to-a-string/). Try that one too.

## Description

We need a function that can transform a string into a number. What ways of achieving this do you know?

Note: Don't worry, all inputs will be strings, and every string is a perfectly valid representation of an integral number.

## Examples

```python
stringToNumber("1234") == 1234
stringToNumber("605" ) == 605
stringToNumber("1405") == 1405
stringToNumber("-7"  ) == -7
```

```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 string_to_number(s):\n    # Ok, let's get real.  Converting from a string of numbers to an integer is easy.\n    # here's the one line that solves this:\n    #     return int(s)\n    #\n    # So let's have some fun...\n    # Let's convert the number to binary first!\n    binary = bin(int(s))\n    print (s + ' in binary: ' + binary)\n    # Then hexadecimal\n    hexa = hex(int(binary,2))  # yeah, cheating by turning binary to decimal, then to hex\n    print(binary + ' in hex: ' + hexa)\n    # Wonder what happens if we reverse the characters in the hex string?\n    remove0x = hexa.replace('0x','')\n    reversed = '0x' + remove0x[::-1]\n    print('Reversed: ' + reversed)\n    # Well that was pointless!\n    # Hmm... take the ascii code of each character in hexa (other than '0x', multiply it by\n    # 10 to the power of (length of the string - index of the character) ?\n    multiplied = ''\n    for i in range(len(remove0x)):\n        multiplied += chr(ord(remove0x[i])*(10*(len(remove0x)-i)))\n    print('Multiplied: ' + multiplied)\n    #\n    # We're getting nowhere fast.\n    see = 0\n    for i in multiplied:\n        see += ord(i)\n    print('Ascii added: ' + str(see))\n    # Nope.\n    rereversed = '0x' + reversed.replace('0x','')[::-1]\n    print(rereversed + ' is ' + reversed + ' reversed again.')\n    if '-' in rereversed:\n        rereversed = '-' + rereversed.replace('-','')\n    # If the number is negative, let's get the negative sign in the right place\n    print('If we change that to integer and return it...  Hmm!')\n    #\n    # Could it be that simple???\n    return int(rereversed,16)"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'string_to_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: 6774