You are given a code:

def main_solution(x):
    return func_20(func_15(x), ('lfar' + 'oeqai'))

Can you predict the output of `main_solution("wnwmthup")` 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": "wnwmthup"}, "ref_output": "\u00ablwf\u00bba\u00abrno\u00bbe\u00abqwa\u00bbi\u00abm\u00bb\u00abt\u00bb\u00abh\u00bb\u00abu\u00bb\u00abp\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), ('lfar' + 'oeqai'))", "funcname": "main_solution"}
rule