You are given a code:

def main_solution(x):
    return func_20(func_9('ylktvv'), func_15('qlid'))

Can you predict the output of `main_solution("byslynouu")` 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": "byslynouu"}, "ref_output": "y\u00ablqk\u00bbt\u00abvlv\u00bbv\u00abvit\u00bbk\u00abldy\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_9('ylktvv'), func_15('qlid'))", "funcname": "main_solution"}
rule