You are given a code:

def main_solution(x):
    return func_20(func_5('vwyif', 'gke'), func_15('nezqbh'))

Can you predict the output of `main_solution("zwggfyu")` 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": "zwggfyu"}, "ref_output": "g\u00abkne\u00bbv\u00abwey\u00bbi\u00abfz\u00bb\u00abq\u00bb\u00abb\u00bb\u00abh\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5('vwyif', 'gke'), func_15('nezqbh'))", "funcname": "main_solution"}
rule