# Leaderboard climbers

In this kata you will be given a leaderboard of unique names for example:

```python
['John',
 'Brian',
 'Jim',
 'Dave',
 'Fred']
```

Then you will be given a list of strings for example:

```python
['Dave +1', 'Fred +4', 'Brian -1']
```

Then you sort the leaderboard.

The steps for our example would be:

```python
# Dave up 1
['John',
 'Brian',
 'Dave',
 'Jim',
 'Fred']
```

```python
# Fred up 4
['Fred',
 'John',
 'Brian',
 'Dave',
 'Jim']
```

```python
# Brian down 1
['Fred',
 'John',
 'Dave',
 'Brian',
 'Jim']
```

Then once you have done this you need to return the leaderboard.

All inputs will be valid. All strings in the second list will never ask to move a name up higher or lower than possible eg. `"John +3"` could not be added to the end of the second input list in the example above.

The strings in the second list will always be something in the leaderboard followed by a space and a `+` or `-` sign followed by a number.

```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 = '\ndef leaderboard_sort(leaderboard, changes):\n    for change in changes:\n        name, pos = change.split()\n        old_pos = leaderboard.index(name)\n        new_pos = eval(f"{old_pos}-{pos}")\n        if old_pos  < new_pos:\n            leaderboard = leaderboard[:old_pos] + leaderboard[old_pos+1:new_pos+1] +  [name] + leaderboard[new_pos+1:]\n        else:\n            leaderboard = leaderboard[:new_pos] + [name] + leaderboard[new_pos:old_pos]+ leaderboard[old_pos+1:]\n    return leaderboard'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'leaderboard_sort'
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: 18981