The power of the string is the maximum length of a non-empty substring that contains only one unique character.

Given a string s, return the power of s.

 

Example 1:

Input: s = "leetcode"
Output: 2
Explanation: The substring "ee" is of length 2 with the character 'e' only.

Example 2:

Input: s = "abbcccddddeeeeedcba"
Output: 5
Explanation: The substring "eeeee" is of length 5 with the character 'e' only.

 

Constraints:

• 1 <= s.length <= 500
• s consists of only lowercase English letters.