Signal Core Extraction

You are processing a stream of telemetry data represented as a string. Your task is to find the length of the shortest contiguous segment (window) that contains at least K distinct symbols, where each of those K symbols appears at least M times within that segment. If no such segment exists, print 0. Input Format: - The first line contains two integers, K and M. - The second line contains a single string S representing the telemetry data. Output Format: - A single integer representing the length of the shortest valid segment. Example: Input: 2 2 abaccaba Output: 4 (Explanation: The segment 'acca' has 2 distinct symbols {'a', 'c'}, and both 'a' and 'c' appear exactly 2 times. Length is 4.)