You are given a code:

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

Can you predict the output of `main_solution("iyjiwye")` 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": "iyjiwye"}, "ref_output": "\u00abxip\u00bba\u00abvye\u00bbe\u00abvja\u00bbp\u00abxi\u00bb\u00abw\u00bb\u00aby\u00bb\u00abe\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_9('xpave'))", "funcname": "main_solution"}
rule