You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('gayqje', 'ymysu'))

Can you predict the output of `main_solution("ycaj")` 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": "ycaj"}, "ref_output": "\u00abgyy\u00bba\u00abmcy\u00bby\u00abqas\u00bbj\u00abuje\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('gayqje', 'ymysu'))", "funcname": "main_solution"}
rule