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Given a positive integer N, return its corresponding column title as it would appear in an Excel sheet.
For N =1 we have column A, for 27 we have AA and so on.
Note: The alphabets are all in uppercase.
N = 51
Complete the function ExcelColumn() which takes N as input and returns output string.
Expected Time Complexity: O(Log(N))
Expected Auxiliary Space: O(Log(N))
1 ≤ N ≤ 107
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