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   "source": [
    "https://leetcode.com/problems/find-smallest-letter-greater-than-target/\n",
    "\n",
    "Runtime: 124 ms, faster than 18.35% of Python3 online submissions for Find Smallest Letter Greater Than Target.\n",
    "Memory Usage: 14.6 MB, less than 20.19% of Python3 online submissions for Find Smallest Letter Greater Than Target.\n",
    "\n",
    "\n",
    "```python\n",
    "import string\n",
    "\n",
    "class Solution:\n",
    "    def nextGreatestLetter(self, letters: List[str], target: str) -> str:\n",
    "        #7:21\n",
    "        abc = list(string.ascii_lowercase)\n",
    "        target_index = abc.index(target)\n",
    "        abc2 = abc[target_index:]\n",
    "        #print(abc2)\n",
    "        letters = list(letters)\n",
    "        def func(c):\n",
    "            if c in abc2: \n",
    "                return abc2.index(c)\n",
    "            else:\n",
    "                return 99999\n",
    "        letters.sort(key=func)\n",
    "        for c in letters:\n",
    "            if c != target:\n",
    "                return c\n",
    "        #7:34\n",
    "```"
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