# Task

Christmas is coming, and your task is to build a custom Christmas tree with the specified characters and the specified height.

# Inputs:
- `chars`: the specified characters. 
- `n`: the specified height. A positive integer greater than 2.

# Output:
- A multiline string. Each line is separated by `\n`. A tree contains two parts: leaves and trunks. 

The leaves should be `n` rows. The first row fill in 1 char, the second row fill in 3 chars, and so on. A single space will be added between two adjust chars, and some of the necessary spaces will be added to the left side, to keep the shape of the tree. No space need to be added to the right side.

The trunk should be at least 1 unit height, it depends on the value of the `n`. The minimum value of n is 3, and the height of the tree trunk is 1 unit height. If `n` increased by 3, and the tree trunk increased by 1 unit. For example, when n is 3,4 or 5, trunk should be 1 row; when n is 6,7 or 8, trunk should be 2 row; and so on.

Still not understand the task? Look at the following example ;-)

# Examples

For `chars = "*@o" and n = 3`,the output should be:
```
  *
 @ o
* @ o
  |
```

For `chars = "*@o" and n = 6`,the output should be:
```
     *
    @ o
   * @ o
  * @ o *
 @ o * @ o
* @ o * @ o
     |
     |
```

For `chars = "1234" and n = 6`,the output should be:
```
     1
    2 3
   4 1 2
  3 4 1 2
 3 4 1 2 3
4 1 2 3 4 1
     |
     |
```

For `chars = "123456789" and n = 3`,the output should be:
```
  1
 2 3
4 5 6
  |
```

```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 = 'from itertools import cycle\n\ndef custom_christmas_tree(chars, n):\n    leaf_provider = cycle(chars)\n    trunk_height = n // 3\n    max_width = 2 * n - 1\n    tree = []\n    def build_row(provider, row_number):\n        return " ".join([provider.__next__() for _ in range(row_number)])\n\n    def padding(row_number):\n        return " " * (max_width // 2 - (2 * row_number - 1) // 2)\n\n    def build_trunk():\n        return [padding(1) + "|" for _ in range(trunk_height)]\n\n    for i in range(n):\n        tree.append(padding(i + 1) + build_row(leaf_provider, i + 1))\n    tree.extend(build_trunk())\n    return "\\n".join(tree)'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'custom_christmas_tree'
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: 7298