Your job is to write a function which increments a string, to create a new string.

- If the string already ends with a number, the number should be incremented by 1.
- If the string does not end with a number. the number 1 should be appended to the new string.

Examples:

`foo -> foo1`

`foobar23 -> foobar24`

`foo0042 -> foo0043`

`foo9 -> foo10`

`foo099 -> foo100`

*Attention: If the number has leading zeros the amount of digits should be considered.*

```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 increment_string(strng):\n    if len(strng) == 0:\n        return "1"\n    \n    if not strng[-1].isdigit():\n        return strng + "1"\n    elif len(strng) == 1:\n        return str(int(strng) + 1)\n    \n    # Append all non-digit characters to new string, keeping track of the index where characters end\n    idx = 0\n    for i, c in enumerate(strng):\n        if not c.isdigit():\n            idx = i\n            \n    num_str = strng[idx + 1:]\n    inc_num_str = str(int(num_str) + 1)\n    \n    return strng[:idx + 1] + inc_num_str.zfill(len(num_str))\n            \n        \n    """if len(strng) > 0 and strng[-1].isdigit():\n        next_num = int(strng[-1]) + 1\n    \n        cur_index = -1 # Start at end of string\n        \n        if next_num < 10:\n            strng = strng[:cur_index] + str(next_num)\n        else:\n            strng = strng[:cur_index] + str(0)\n            cur_index -= 1\n            \n            while (abs(cur_index) <= len(strng)):\n                if not strng[cur_index].isdigit():\n                    return strng[:cur_index ] + "1" + strng[cur_index:]\n                \n                cur_num = int(strng[cur_index])\n                if cur_num < 9:\n                    strng = strng[:cur_index] + str(cur_num + 1) + strng[cur_index + 1:]\n                    return strng\n                else:\n                    strng = strng[:cur_index] + str(0) + strng[cur_index + 1:]\n                    cur_index -= 1\n    else:\n        strng += \'1\'\n                \n    return strng\n    """'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'increment_string'
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: 5793