You are given a code:

def main_solution(x):
    return func_20(func_20('sfdtk', x), func_15(x))

Can you predict the output of `main_solution("zox")` 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": "zox"}, "ref_output": "s\u00abzzf\u00bbo\u00abdox\u00bbt\u00abkx\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('sfdtk', x), func_15(x))", "funcname": "main_solution"}
rule