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 \n     quantity_unit = [\'\', \'Thousand\', \'Million\', \'Billion\']\n     digit_to_str = [\'\', \' One\', \' Two\', \' Three\', \' Four\', \' Five\', \' Six\', \' Seven\', \' Eight\', \' Nine\']\n \n     ten_to_str = {10: \'Ten\', 11: \'Eleven\', 12: \'Twelve\', 13: \'Thirteen\', 14: \'Fourteen\', 15: \'Fifteen\', 16: \'Sixteen\',\n                   17: \'Seventeen\', 18: \'Eighteen\', 19: \'Nineteen\', 20: \'Twenty\', 30: \'Thirty\', 40: \'Forty\', 50: \'Fifty\',\n                   60: \'Sixty\', 70: \'Seventy\', 80: \'Eighty\', 90: \'Ninety\', 0: \'\'}\n \n     def read_three_digits(self, unit, ten, hundred, index):\n \n         if ten == 1:\n             str_of_num = \' \' + Solution.ten_to_str[ten * 10 + unit]\n         else:\n             str_of_num = (\' \' + Solution.ten_to_str[ten * 10] + Solution.digit_to_str[unit]) if ten > 1 else Solution.digit_to_str[unit]\n \n         str_of_num = (Solution.digit_to_str[hundred] + \' Hundred\' if hundred > 0 else "") + str_of_num\n         # print(str_of_num + str(index))\n         return str_of_num[1:] + \' \' + Solution.quantity_unit[index] if str_of_num else str_of_num[1:]\n \n     def numberToWords(self, num):\n         """\n         :type num: int\n         :rtype: str\n         """\n         if num == 0:\n             return \'Zero\'\n \n         str_of_num = ""\n         index = 0\n         while num > 0:\n             part = num % 1000\n             unit = part % 10\n             ten = (part % 100) // 10\n             hundred = part // 100\n             str_of_num = self.read_three_digits(unit, ten, hundred, index) + \' \' + str_of_num.strip()\n             num //= 1000\n             index += 1\n         return str_of_num.strip()'
_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: 5941