You are given a code:

def main_solution(x):
    return func_20(func_15('uypz'), func_11(x, 3))

Can you predict the output of `main_solution("yayrmpxqdm")` 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": "yayrmpxqdm"}, "ref_output": "\u00abbud\u00bbb\u00abuyp\u00bbs\u00abapt\u00bbg\u00abpz\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('uypz'), func_11(x, 3))", "funcname": "main_solution"}
rule