When provided with a number between 0-9, return it in words.

Input :: 1

Output :: "One".

If your language supports it, try using a switch statement.

```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 switch_it_up(num):\n    d = { 0 : 'Zero', 1 : 'One', 2 : 'Two', 3 : 'Three', 4 : 'Four', 5 : 'Five',\n          6 : 'Six', 7 : 'Seven', 8 : 'Eight', 9 : 'Nine', 10 : 'Ten',\n          11 : 'Eleven', 12 : 'Twelve', 13 : 'Thirteen', 14 : 'fourteen',\n          15 : 'Fifteen', 16 : 'Sixteen', 17 : 'Seventeen', 18 : 'eighteen',\n          19 : 'Nineteen', 20 : 'Twenty',\n          30 : 'Thirty', 40 : 'Forty', 50 : 'Fifty', 60 : 'Sixty',\n          70 : 'Seventy', 80 : 'Eighty', 90 : 'Ninety' }\n    k = 1000\n    m = k * 1000\n    b = m * 1000\n    t = b * 1000\n\n    assert(0 <= num)\n\n    if (num < 20):\n        return d[num]\n\n    if (num < 100):\n        if num % 10 == 0: return d[num]\n        else: return d[num // 10 * 10] + '-' + d[num % 10]\n\n    if (num < k):\n        if num % 100 == 0: return d[num // 100] + ' hundred'\n        else: return d[num // 100] + ' hundred and ' + int_to_en(num % 100)\n\n    if (num < m):\n        if num % k == 0: return int_to_en(num // k) + ' thousand'\n        else: return int_to_en(num // k) + ' thousand, ' + int_to_en(num % k)\n\n    if (num < b):\n        if (num % m) == 0: return int_to_en(num // m) + ' million'\n        else: return int_to_en(num // m) + ' million, ' + int_to_en(num % m)\n\n    if (num < t):\n        if (num % b) == 0: return int_to_en(num // b) + ' billion'\n        else: return int_to_en(num // b) + ' billion, ' + int_to_en(num % b)\n\n    if (num % t == 0): return int_to_en(num // t) + ' trillion'\n    else: return int_to_en(num // t) + ' trillion, ' + int_to_en(num % t)\n\n    raise AssertionError('num is too large: %s' % str(num))"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'switch_it_up'
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: 8122