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Challenge Points: 10
Level: EasyIn Excel, columns are labeled alphabetically — for example, the first column is labeled "A", the second "B", and so on up to "Z". After "Z", the sequence continues as "AA", "AB", "AC", etc.
You are given an integer columnNumber, and your task is to return the corresponding Excel column title.
Input: columnNumber = 3
Output: "C"
Input: columnNumber = 55
Output: "BC"
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