You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_20('qfguz', 'hjumr'))

Can you predict the output of `main_solution("xsko")` 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": "xsko"}, "ref_output": "\u00abqxh\u00bbf\u00abjsg\u00bbu\u00abukm\u00bbz\u00abro\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_20('qfguz', 'hjumr'))", "funcname": "main_solution"}
rule