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All leaked interview problems are collected from Internet.

Find the length of the longest substring ** T** of a given string (consists of lowercase letters only) such that every character in

**Example 1:**

Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa", as 'a' is repeated 3 times.

**Example 2:**

Input: s = "ababbc", k = 2 Output: 5 The longest substring is "ababb", as 'a' is repeated 2 times and 'b' is repeated 3 times.

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