You are given a code:

def main_solution(x):
    return func_20(func_20('ajvywv', x), func_15('kepsdv'))

Can you predict the output of `main_solution("llwy")` 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": "llwy"}, "ref_output": "a\u00ablkj\u00bbl\u00abvew\u00bby\u00abypw\u00bbv\u00abs\u00bb\u00abd\u00bb\u00abv\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('ajvywv', x), func_15('kepsdv'))", "funcname": "main_solution"}
rule