## Task

Create a function that given a sequence of strings, groups the elements that can be obtained by rotating others, ignoring upper or lower cases. 

In the event that an element appears more than once in the input sequence, only one of them will be taken into account for the result, discarding the rest. 

## Input

Sequence of strings. Valid characters for those strings are uppercase and lowercase characters from the alphabet and whitespaces.

## Output

Sequence of elements. Each element is the group of inputs that can be obtained by rotating the strings. 

Sort the elements of each group alphabetically. 

Sort the groups descendingly by size and in the case of a tie, by the first element of the group alphabetically.

## Examples

```python
['Tokyo', 'London', 'Rome', 'Donlon', 'Kyoto', 'Paris', 'Okyot'] --> [['Kyoto', 'Okyot', 'Tokyo'], ['Donlon', 'London'], ['Paris'], ['Rome']]

['Rome', 'Rome', 'Rome', 'Donlon', 'London'] --> [['Donlon', 'London'], ['Rome']]

[] --> []
```

```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 collections import deque\nfrom operator import itemgetter\n\n\ndef group_cities(seq):\n    seq_by_length = {}\n    for s in seq:\n        l = len(s)\n        if l in seq_by_length:\n            seq_by_length[l].append(s)\n        else:\n            seq_by_length[l] = [s]\n\n    groups = []\n    for elems in seq_by_length.values():\n        to_check = deque(set(elems))\n\n        while to_check:\n            cur_check = to_check.pop()\n            group, check = [cur_check], cur_check.lower() * 2\n\n            for c in to_check.copy():\n                if c.lower() in check:\n                    group.append(c)\n                    to_check.remove(c)\n\n            groups.append(sorted(group))\n\n    return sorted(sorted(groups, key=itemgetter(0)), key=len, reverse=True)'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'group_cities'
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: 8593