<p>Given an integer <code>n</code>, <em>return a string with <code>n</code> characters such that each character in such string occurs <strong>an odd number of times</strong></em>.</p>
<p>The returned string must contain only lowercase English letters. If there are multiples valid strings, return <strong>any</strong> of them. </p>
<strong>Explanation:</strong>"pppz" is a valid string since the character 'p' occurs three times and the character 'z' occurs once. Note that there are many other valid strings such as "ohhh" and "love".
<strong>Explanation:</strong>"xy" is a valid string since the characters 'x' and 'y' occur once. Note that there are many other valid strings such as "ag" and "ur".