You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'zlh'), func_15(x))

Can you predict the output of `main_solution("mggnnvzxge")` 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": "mggnnvzxge"}, "ref_output": "z\u00ablmh\u00bbm\u00abggg\u00bbn\u00abngv\u00bbz\u00abxng\u00bbe\u00abn\u00bb\u00abv\u00bb\u00abz\u00bb\u00abx\u00bb\u00abg\u00bb\u00abe\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'zlh'), func_15(x))", "funcname": "main_solution"}
rule