human
I found an interesting problem on https://leetcode.com/problems/excel-sheet-column-title/:
Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

    1 -> A
    2 -> B
    3 -> C
    ...
    26 -> Z
    27 -> AA
    28 -> AB 
    ...

Example 1:

Input: 1
Output: "A"

Example 2:

Input: 28
Output: "AB"

Example 3:

Input: 701
Output: "ZY"

I tried it in Python, but could not do it. Can you solve it?

 ... Write me a the Python program you requested?
assistant
#Here is the Python program you requested.

class Solution:
     def convertToTitle(self, num):
         res = []
         
         while num > 0:
             res.append(chr(ord('A') + (num - 1) % 26))
             num = (num - 1) // 26
         res.reverse()
         return "".join(res)
         
         """
         :type n: int
         :rtype: str
         """