You are given a code:

def main_solution(x):
    return func_20(('ybtyx' + x), func_15('chta'))

Can you predict the output of `main_solution("ayetwvtws")` 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": "ayetwvtws"}, "ref_output": "y\u00abbct\u00bby\u00abxha\u00bby\u00abett\u00bbw\u00abvat\u00bbws", "ref_code": "def main_solution(x):\n    return func_20(('ybtyx' + x), func_15('chta'))", "funcname": "main_solution"}
rule