# 1002. Find Common Characters

https://leetcode.com/problems/find-common-characters

## Description

Given a string array `words`, return _an array of all characters that show up in all strings within the_ `words` _(including duplicates)_. You may return the answer in **any order**.

**Example 1:**

```
**Input:** words = ["bella","label","roller"]
**Output:** ["e","l","l"]
```

**Example 2:**

```
**Input:** words = ["cool","lock","cook"]
**Output:** ["c","o"]
```

**Constraints:**

* `1 <= words.length <= 100`
* `1 <= words[i].length <= 100`
* `words[i]` consists of lowercase English letters.

## ac

```java
```
