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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: 5.8 MB, less than 31.15% of C online submissions for Reverse Only Letters.\n",
    "\n",
    "\n",
    "```c\n",
    "#include <stdio.h>\n",
    "#include <string.h>\n",
    "#include <ctype.h>\n",
    "\n",
    "char r[101];\n",
    "char e1;\n",
    "char e2;\n",
    "\n",
    "char *reverseOnlyLetters(char *S)\n",
    "{\n",
    "    strcpy(r, \"\");\n",
    "    int length = (int)strlen(S);\n",
    "    int i1 = 0;\n",
    "    int i2 = 0;\n",
    "    int i2Temp = 0;\n",
    "    //printf(\"%d\", length);\n",
    "    for (int i = 0; i < length; ++i)\n",
    "    {\n",
    "        e1 = S[i];\n",
    "        if (isalpha(e1) != 0)\n",
    "        {\n",
    "            i2Temp = i2;\n",
    "            while (i2Temp < length)\n",
    "            {\n",
    "                e2 = S[length - i2Temp - 1];\n",
    "                if (isalpha(e2) != 0)\n",
    "                {\n",
    "                    strcat(r, &e2);\n",
    "                    i2 = i2Temp + 1;\n",
    "                    break;\n",
    "                }\n",
    "                i2Temp += 1;\n",
    "            }\n",
    "        }\n",
    "        else\n",
    "        {\n",
    "            strcat(r, &e1);\n",
    "        }\n",
    "        i1 += 1;\n",
    "    }\n",
    "    return r;\n",
    "}\n",
    "\n",
    "int main(int argc, char *argv[])\n",
    "{\n",
    "    printf(\"%s\", reverseOnlyLetters(\"hello\"));\n",
    "    printf(\"%s\", \"\\n\\n\");\n",
    "    //printf(\"%s\", \"Hello World.\\nMy name is yingshaoxo.\\n\");\n",
    "}\n",
    "```"
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