# 1796. Second Largest Digit in a String

<https://leetcode.com/problems/second-largest-digit-in-a-string>

## Description

Given an alphanumeric string `s`, return *the **second largest** numerical digit that appears in* `s`*, or* `-1` *if it does not exist*.

An **alphanumeric**string is a string consisting of lowercase English letters and digits.

**Example 1:**

```
**Input:** s = "dfa12321afd"
**Output:** 2
**Explanation:** The digits that appear in s are [1, 2, 3]. The second largest digit is 2.
```

**Example 2:**

```
**Input:** s = "abc1111"
**Output:** -1
**Explanation:** The digits that appear in s are [1]. There is no second largest digit. 
```

**Constraints:**

* `1 <= s.length <= 500`
* `s` consists of only lowercase English letters and/or digits.

## ac

```java
```


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