You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_15('yjljjf'))

Can you predict the output of `main_solution("bskfjchzpj")` 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": "bskfjchzpj"}, "ref_output": "\u00ab\u00abby\u00bb\u00bb\u00ab\u00absj\u00bb\u00bb\u00ab\u00abkl\u00bb\u00bb\u00ab\u00abfj\u00bb\u00bb\u00ab\u00abjj\u00bb\u00bb\u00ab\u00abcf\u00bb\u00bb\u00abh\u00bb\u00abz\u00bb\u00abp\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_15('yjljjf'))", "funcname": "main_solution"}
rule