You are given a code:

def main_solution(x):
    return func_20(func_15('ltrn'), func_20('leyx', 'srbs'))

Can you predict the output of `main_solution("mwwxhv")` 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": "mwwxhv"}, "ref_output": "\u00ablls\u00bbe\u00abrty\u00bbb\u00abxrs\u00bb\u00abn\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('ltrn'), func_20('leyx', 'srbs'))", "funcname": "main_solution"}
rule