You are given a code:

def main_solution(x):
    return func_20((x + 'ckwrwi'), func_15('dvvxi'))

Can you predict the output of `main_solution("byasdtzx")` 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": "byasdtzx"}, "ref_output": "b\u00abyda\u00bbs\u00abdvt\u00bbz\u00abxvc\u00bbk\u00abwxr\u00bbw\u00abii\u00bb", "ref_code": "def main_solution(x):\n    return func_20((x + 'ckwrwi'), func_15('dvvxi'))", "funcname": "main_solution"}
rule