# 0168. Excel Sheet Column Title

https://leetcode.com/problems/excel-sheet-column-title

## Description

Given an integer `columnNumber`, return _its corresponding column title as it appears in an Excel sheet_.

For example:

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

**Example 1:**

```
**Input:** columnNumber = 1
**Output:** "A"
```

**Example 2:**

```
**Input:** columnNumber = 28
**Output:** "AB"
```

**Example 3:**

```
**Input:** columnNumber = 701
**Output:** "ZY"
```

**Example 4:**

```
**Input:** columnNumber = 2147483647
**Output:** "FXSHRXW"
```

**Constraints:**

* `1 <= columnNumber <= 231 - 1`

## ac

```java
```
