Balancing Brackets in a Document

You are given a string representing a document where some characters are brackets: '(', ')', '{', '}', '[' and ']'. Your task is to confirm whether the brackets in the document are balanced. A sequence of brackets is considered balanced if they are properly closed and nested. Implement a function that reads the input string and outputs 'True' if the document is balanced, 'False' otherwise. Input Format: - A single string containing the document. Output Format: - 'True' or 'False'. Example: Input: {[()]} Output: True