Your task in order to complete this Kata is to write a function which formats a duration, given as a number of seconds, in a human-friendly way.

The function must accept a non-negative integer. If it is zero, it just returns `"now"`. Otherwise,  the duration is expressed as a combination of `years`, `days`, `hours`, `minutes` and `seconds`.

It is much easier to understand with an example:

```Fortran
formatDuration (62)    // returns "1 minute and 2 seconds"
formatDuration (3662)  // returns "1 hour, 1 minute and 2 seconds"
```
```python
format_duration(62)    # returns "1 minute and 2 seconds"
format_duration(3662)  # returns "1 hour, 1 minute and 2 seconds"
```

**For the purpose of this Kata, a year is 365 days and a day is 24 hours.**

Note that spaces are important.

### Detailed rules

The resulting expression is made of components like `4 seconds`, `1 year`, etc.  In general, a positive integer and one of the valid units of time, separated by a space. The unit of time is used in plural if the integer is greater than 1.

The components are separated by a comma and a space (`", "`). Except the last component, which is separated by `" and "`, just like it would be written in English. 

A more significant units of time will occur before than a least significant one. Therefore, `1 second and 1 year` is not correct, but `1 year and 1 second` is.

Different components have different unit of times. So there is not repeated units like in `5 seconds and 1 second`.

A component will not appear at all if its value happens to be zero.  Hence, `1 minute and 0 seconds` is not valid, but it should be just `1 minute`.

 A unit of time must be used "as much as possible". It means that the function should not return `61 seconds`, but `1 minute and 1 second` instead.  Formally, the duration specified by  of a component must not be greater than any valid more significant unit of time.

```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 f(n, unit):\n    return [', ', '{} {}{}'.format(n, unit, 's' if n > 1 else '')]\n\ndef format_duration(seconds):\n    if not seconds: return 'now'\n\n    minutes, seconds = divmod(seconds, 60)\n    hours, minutes = divmod(minutes, 60)\n    days, hours = divmod(hours, 24)\n    years, days = divmod(days, 365)\n\n    fs = []\n    if years: fs.extend(f(years, 'year'))\n    if days: fs.extend(f(days, 'day'))\n    if hours: fs.extend(f(hours, 'hour'))\n    if minutes: fs.extend(f(minutes, 'minute'))\n    if seconds: fs.extend(f(seconds, 'second'))\n\n    fs[-2] = ' and '\n    fs.pop(0)\n    return ''.join(fs)"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'format_duration'
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: 5890