# 0917. Reverse Only Letters

<https://leetcode.com/problems/reverse-only-letters>

## Description

Given a string `s`, reverse the string according to the following rules:

* All the characters that are not English letters remain in the same position.
* All the English letters (lowercase or uppercase) should be reversed.

Return `s` *after reversing it*.

**Example 1:**

```
**Input:** s = "ab-cd"
**Output:** "dc-ba"
```

**Example 2:**

```
**Input:** s = "a-bC-dEf-ghIj"
**Output:** "j-Ih-gfE-dCba"
```

**Example 3:**

```
**Input:** s = "Test1ng-Leet=code-Q!"
**Output:** "Qedo1ct-eeLg=ntse-T!"
```

**Constraints:**

* `1 <= s.length <= 100`
* `s` consists of characters with ASCII values in the range `[33, 122]`.
* `s` does not contain `'\"'` or `'\\'`.

## ac

```java
```