##Overview

Write a helper function that takes in a Time object and converts it to a more human-readable format. You need only go up to '_ weeks ago'.
```python
to_pretty(0) => "just now"

to_pretty(40000) => "11 hours ago"
```
##Specifics
 - The output will be an amount of time, t, included in one of the following phrases: "just now", "[t] seconds ago", "[t] minutes ago", "[t] hours ago", "[t] days ago", "[t] weeks ago".
 - You will have to handle the singular cases. That is, when t = 1, the phrasing will be one of "a second ago", "a minute ago", "an hour ago", "a day ago", "a week ago".
 - The amount of time is always rounded down to the nearest integer. For example, if the amount of time is actually 11.73 hours ago, the return value will be "11 hours ago".
 - Only times in the past will be given, with the range "just now" to "52 weeks ago"

```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 to_pretty(seconds):\n    w, d, h, m, s = seconds // 604800, seconds % 604800 // 86400, seconds % 604800 % 86400 // 3600, seconds % 604800 % 86400 % 3600 // 60, seconds % 604800 % 86400 % 3600 % 60\n    return ('just now' if not seconds else\n            [f'a week ago', f'{w} weeks ago'][w > 1]     if w > 0 else\n            [f'a day ago', f'{d} days ago'][d > 1]       if d > 0 else\n            [f'an hour ago', f'{h} hours ago'][h > 1]    if h > 0 else\n            [f'a minute ago', f'{m} minutes ago'][m > 1] if m > 0 else\n            [f'a second ago', f'{s} seconds ago'][s > 1])"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'to_pretty'
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: 5678