Your task is to write a function which counts the number of squares contained in an ASCII art picture.

The input pictures contain rectangles---some of them squares---drawn with the characters `-`, `|`, and `+`, where `-` and `|` are used to represent horizontal and vertical sides, and `+` is used to represent corners and intersections. Each picture may contain multiple, possibly overlapping, rectangles.

A simple example input looks like this:

    +--+  +----+
    |  |  |    |    +-+
    |  |  +----+    | |
    +--+            +-+
    
There are two squares and one rectangle in this picture, so your function should return 2 for this input.

The following picture does not contain any squares, so the answer for this one is 0:

    +------+
    |      |
    +------+

Here is another, more complex input:

    +---+
    |   |
    | +-+-+
    | | | |
    +-+-+ |
      |   |
      +---+

The answer for this one is 3: two big squares, and a smaller square formed by the intersection of the two bigger ones. Similarly, the answer for the following picture is 5:

    +-+-+
    | | |
    +-+-+
    | | |
    +-+-+

You are going to implement a function `count_squares()` which takes an ASCII art picture as input and returns the number of squares the picture shows. The input to that function is an array of strings, where each string corresponds to a line of the ASCII art picture. Each string is guaranteed to contain only the characters `-`, `|`, `+`, and `` `` (space).

The smallest valid square has a side length of 2 and is represented by four `+` characters arranged in a square; a single `+` character is not considered a square.

Have fun!

```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 count_squares(lines):\n    def is_topleft(i, j):\n        b = lines[i][j] == '+'\n        b = b and i+1 < len(lines) and j < len(lines[i+1]) and lines[i+1][j] in '|+' \n        b = b and j+1 < len(lines[i]) and lines[i][j+1] in '-+'\n        return b\n    def is_square(i, j, k):\n        b = i + k < len(lines) and all(j + k < len(lines[r]) for r in range(i, i+k+1))\n        b = b and lines[i][j] == lines[i][j+k] == lines[i+k][j] == lines[i+k][j+k] == '+'\n        if k > 1:\n            b = b and all(lines[r][j] in '+|' and lines[r][j+k] in '+|' for r in range(i, i+k+1))\n            b = b and all(lines[i][c] in '+-' and lines[i+k][c] in '+-'for c in range(j, j+k+1))\n        return b\n    cnt = 0\n    for i in range(len(lines)-1):\n        for j in range(len(lines[i])-1):\n            if is_topleft(i, j):\n                for k in range(1, len(lines[i]) - j):\n                    if is_square(i, j, k):\n                        cnt += 1\n    return cnt"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'count_squares'
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: 7826