You are given a code:

def main_solution(x):
    return func_20(func_15('dhznep'), func_9(x))

Can you predict the output of `main_solution("mtnijvp")` 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": "mtnijvp"}, "ref_output": "\u00abmdt\u00bbn\u00abihj\u00bbv\u00abpzp\u00bbv\u00abjni\u00bbn\u00abtem\u00bb\u00abp\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('dhznep'), func_9(x))", "funcname": "main_solution"}
rule