Image Layer Decoder

You are given a string that encodes a series of image layers using a specific syntax. Each layer is represented as 'N[...]', where 'N' is the number of times the layer within the brackets should be repeated. Your task is to decode this string into a flat sequence of layers. Write a program that reads the encoded string and outputs the fully decoded layers. Input format: - A single line containing the encoded string (e.g., '3[abc]2[de]'). Output format: - A single line containing the fully decoded string. Example: Input: 3[abc]2[de] Output: abcabcabcde