DNA sequencing data can be stored in many different formats. In this Kata, we will be looking at SAM formatting. It is a plain text file where every line (excluding the first header lines) contains data about a "read" from whatever sample the file comes from. Rather than focusing on the whole read, we will take two pieces of information: the cigar string and the nucleotide sequence.

The cigar string is composed of numbers and flags. It represents how the read aligns to what is known as a reference genome. A reference genome is an accepted standard for mapping the DNA. 

The nucleotide sequence shows us what bases actually make up that section of DNA. They can be represented with the letters A, T, C, or G.

Example Read: ('36M', 'ACTCTTCTTGCGAAAGTTCGGTTAGTAAAGGGGATG')

The M in the above cigar string stands for "match", and the 36 stands for the length of the nucleotide sequence. Since all 36 bases are given the 'M' distinction, we know they all matched the reference.

Example Read: ('20M10S',  'ACTCTTCTTGCGAAAGTTCGGTTAGTAAAG')

In the above cigar string, only 20 have the "M" distinction, but the length of the actual string of nucleotides is 30. Therefore we know that read did not match the reference. (Don't worry about what the other letters mean. That will be covered in a later kata.)

Your job for this kata is to create a function that determines whether a cigar string fully matches the reference and accounts for all bases. If it does fully match, return True. If the numbers in the string do not match the full length of the string, return 'Invalid cigar'. If it does not fully match, return False.

*Note for C++: Return True, False, or Invalid cigar as strings*

```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 = "import re\n\ndef is_matched(read):\n    cigar, seq = read\n    matches = re.findall(r'(\\d+)([A-Z])', cigar)\n    if sum(int(n) for n, _ in matches) != len(seq):\n        return 'Invalid cigar'\n    return all(sym == 'M' for _, sym in matches)"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'is_matched'
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: 37541