Stack Depth

You are given a representation of a nested list using brackets. Each opening bracket (either '[' or '{') indicates a new depth level in the structure. Your task is to calculate the maximum depth of the nested structure. Input: A single line containing a string that consists of the characters '[', ']', '{', '}', each with a maximum length of 10000. Output: An integer representing the maximum depth of the nested structure. Example: Input: [1, [2, {3, 4}, [5]]] Output: 3