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     digit = {\n         0: \'\',\n         1: \'One\',\n         2: \'Two\',\n         3: \'Three\',\n         4: \'Four\',\n         5: \'Five\',\n         6: \'Six\',\n         7: \'Seven\',\n         8: \'Eight\',\n         9: \'Nine\'\n         }\n     \n     teen = {\n         10: \'Ten\',\n         11: \'Eleven\',\n         12: \'Twelve\',\n         13: \'Thirteen\',\n         14: \'Fourteen\',\n         15: \'Fifteen\',\n         16: \'Sixteen\',\n         17: \'Seventeen\',\n         18: \'Eighteen\',\n         19: \'Nineteen\'\n     }\n     \n     ten = {\n         2: \'Twenty\',\n         3: \'Thirty\',\n         4: \'Forty\',\n         5: \'Fifty\',\n         6: \'Sixty\',\n         7: \'Seventy\',\n         8: \'Eighty\',\n         9: \'Ninety\'\n     }\n     \n     idx = {\n         0: \'\',\n         1: \'Thousand\',\n         2: \'Million\',\n         3: \'Billion\',\n         4: \'Trillion\',\n         5: \'Quadrillion\'\n     }\n     def helper(self,num):\n         result = ""\n         while len(num) < 3:\n             num = \'0\' + num   \n         \n         if num[0] is not \'0\':\n             result = self.digit[int(num[0])] + \' Hundred\'\n         if num[1] is not \'0\':\n             if num[1] == \'1\':\n                 return result + " " + self.teen[int(num[1]+num[2])]\n             else:\n                 return result + " " + self.ten[int(num[1])] + " " + self.digit[int(num[2])]\n         if num[2] is not \'0\':\n             result = result + " " + self.digit[int(num[2])]\n         return result\n     \n     def numberToWords(self, num):\n         """\n         :type num: int\n         :rtype: str\n         """\n         if num == 0:\n             return \'Zero\'\n         result = ""\n         rev = str(num)[::-1]\n         slices = [rev[i:i+3] for i in range(0,len(str(num)),3)]\n         \n         for idx, slice in enumerate((slices)):\n             if slice == \'000\':\n                 continue\n             else:\n                 result = self.helper(str(slice[::-1])) + " " + self.idx[idx] + " "+ result\n         result = result.split(\' \')\n         result = [ x for x in result if x is not ""]   \n         return \' \'.join(result)\n     \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: 6875