You are given a code:

def main_solution(x):
    return func_20(func_5('nyr', 'mpak'), func_15('hty'))

Can you predict the output of `main_solution("ssbbztv")` 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": "ssbbztv"}, "ref_output": "m\u00abpha\u00bbk\u00abnty\u00bbr\u00aby\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5('nyr', 'mpak'), func_15('hty'))", "funcname": "main_solution"}
rule