You are given a code:

def main_solution(x):
    return func_17(func_15('gbfib'))

Can you predict the output of `main_solution("dtwkdebg")` without writing any code? Please reason and put your final answer in the following json format: {"output": <your output>}, where <your output> should be the final string.
user
{"ref_input": {"x": "dtwkdebg"}, "ref_output": "\u00bbb\u00ab\u00bbi\u00ab\u00bbf\u00ab\u00bbb\u00ab\u00bbg\u00ab", "ref_code": "def main_solution(x):\n    return func_17(func_15('gbfib'))", "funcname": "main_solution"}
rule