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    "https://leetcode.com/problems/most-common-word\n",
    "\n",
    "\n",
    "Runtime: 40 ms, faster than 36.43% of Python3 online submissions for Most Common Word.\n",
    "Memory Usage: 14.4 MB, less than 20.43% of Python3 online submissions for Most Common Word.\n",
    "\n",
    "\n",
    "```python\n",
    "import re \n",
    "\n",
    "class Solution:\n",
    "    def mostCommonWord(self, paragraph: str, banned: List[str]) -> str:\n",
    "        #5:43\n",
    "        def word_only(word):\n",
    "            n = \"\"\n",
    "            for c in word:\n",
    "                if c.isalpha():\n",
    "                    n += c.lower()\n",
    "            return n\n",
    "        \n",
    "        words = re.split(r\"[ ,]\", paragraph)\n",
    "        \n",
    "        d = dict()\n",
    "        for word in words:\n",
    "            word = word_only(word)\n",
    "            if len(word):\n",
    "                if word in d:\n",
    "                    d[word] += 1\n",
    "                else:\n",
    "                    d[word] = 1\n",
    "        items = {k: v for k, v in sorted(d.items(), key=lambda item: item[1])}\n",
    "        print(items)\n",
    "        for word in reversed(items.keys()):\n",
    "            if word not in banned:\n",
    "                return word\n",
    "        #6:01\n",
    "```"
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