Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 231 - 1.

Example 1:


Input: 123
Output: "One Hundred Twenty Three"


Example 2:


Input: 12345
Output: "Twelve Thousand Three Hundred Forty Five"

Example 3:


Input: 1234567
Output: "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven"


Example 4:


Input: 1234567891
Output: "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One"

```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 = 'class Solution:\n     def numberToWords(self, num):\n         return \' \'.join(self.words(num)) or \'Zero\'\n         \n         \n     def words(self, n):\n         print(n)\n         to19 = [\'One\', \'Two\', \'Three\', \'Four\', \'Five\', \'Six\', \'Seven\', \'Eight\', \'Nine\', \'Ten\', \'Eleven\', \'Twelve\', \'Thirteen\', \'Fourteen\', \'Fifteen\', \'Sixteen\', \'Seventeen\', \'Eighteen\', \'Nineteen\']\n         tens = [\'Twenty\', \'Thirty\', \'Forty\', \'Fifty\', \'Sixty\', \'Seventy\', \'Eighty\', \'Ninety\',]\n                         \n         if n < 20:\n             return to19[n - 1: n]\n         if n < 100:\n             return [tens[n//10 - 2]] + self.words(n%10)\n         if n < 1000:\n             return [to19[n//100 - 1]] + [\'Hundred\'] + self.words(n%100)\n             \n         for p, w in enumerate((\'Thousand\', \'Million\', \'Billion\'), 1):\n             if n < 1000**(p + 1):\n                 return self.words(n//1000**p)  + [w] + self.words(n%1000**p)\n         \n         """\n         :type num: int\n         :rtype: str\n         """\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'numberToWords'
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: 7451