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            "title": "License Key Formatting",
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            "content": "<p>You are given a license key represented as a string <code>s</code> that consists of only alphanumeric characters and dashes. The string is separated into <code>n + 1</code> groups by <code>n</code> dashes. You are also given an integer <code>k</code>.</p>\n\n<p>We want to reformat the string <code>s</code> such that each group contains exactly <code>k</code> characters, except for the first group, which could be shorter than <code>k</code> but still must contain at least one character. Furthermore, there must be a dash inserted between two groups, and you should convert all lowercase letters to uppercase.</p>\n\n<p>Return <em>the reformatted license key</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;5F3Z-2e-9-w&quot;, k = 4\n<strong>Output:</strong> &quot;5F3Z-2E9W&quot;\n<strong>Explanation:</strong> The string s has been split into two parts, each part has 4 characters.\nNote that the two extra dashes are not needed and can be removed.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = &quot;2-5g-3-J&quot;, k = 2\n<strong>Output:</strong> &quot;2-5G-3J&quot;\n<strong>Explanation:</strong> The string s has been split into three parts, each part has 2 characters except the first part as it could be shorter as mentioned above.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists of English letters, digits, and dashes <code>&#39;-&#39;</code>.</li>\n\t<li><code>1 &lt;= k &lt;= 10<sup>4</sup></code></li>\n</ul>\n",
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