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    "https://leetcode.com/problems/reverse-only-letters\n",
    "\n",
    "\n",
    "Runtime: 0 ms, faster than 100.00% of C++ online submissions for Reverse Only Letters.\n",
    "Memory Usage: 6.4 MB, less than 60.53% of C++ online submissions for Reverse Only Letters.\n",
    "\n",
    "\n",
    "```cpp\n",
    "#include <iostream>\n",
    "#include <vector>\n",
    "#include <math.h>\n",
    "#include <ctype.h>\n",
    "#include <bits/stdc++.h> \n",
    "\n",
    "using namespace std;\n",
    "\n",
    "class Solution {\n",
    "public:\n",
    "    string myReverse(string S) {\n",
    "        string S2 = S; \n",
    "        reverse(S2.begin(), S2.end()); \n",
    "        int length = S.length();\n",
    "        int i1 = 0;\n",
    "        int i2 = 0;\n",
    "        int i2Temp;\n",
    "        string r = \"\";\n",
    "        char e1;\n",
    "        char e2;\n",
    "        while (i1 < length) {\n",
    "            e1 = S[i1];\n",
    "            if (isalpha(e1)) {\n",
    "                i2Temp = i2;\n",
    "                while (i2Temp < length) {\n",
    "                    e2 = S2[i2Temp];\n",
    "                    if (isalpha(e2)) {\n",
    "                        r += e2;\n",
    "                        i2 = i2Temp + 1;\n",
    "                        break;\n",
    "                    }\n",
    "                    i2Temp += 1;\n",
    "                }\n",
    "            } else {\n",
    "                r += e1;\n",
    "            }\n",
    "            i1 += 1;\n",
    "        }\n",
    "        return r;\n",
    "    }\n",
    "\n",
    "    string reverseOnlyLetters(string S) {\n",
    "        return myReverse(S);\n",
    "    }\n",
    "};\n",
    "```"
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