You are given a code:

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

Can you predict the output of `main_solution("yim")` 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": "yim"}, "ref_output": "i\u00abobm\u00bbm\u00abobi\u00bb\u00abt\u00bb\u00abz\u00bb\u00abq\u00bb\u00abw\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9('iom'), func_15('bbtzqw'))", "funcname": "main_solution"}
rule