You are given a code:

def main_solution(x):
    return func_20(func_15('bmm'), func_13('sygrn', '-'))

Can you predict the output of `main_solution("aruodo")` 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": "aruodo"}, "ref_output": "\u00absb-\u00bby\u00ab-mg\u00bb-\u00abrm-\u00bbn", "ref_code": "def main_solution(x):\n    return func_20(func_15('bmm'), func_13('sygrn', '-'))", "funcname": "main_solution"}
rule