You are given a code:

def main_solution(x):
    return func_20(func_15('wkujf'), func_1(x, 4))

Can you predict the output of `main_solution("qzpgwsrpcj")` 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": "qzpgwsrpcj"}, "ref_output": "\u00abqwz\u00bbp\u00abgkw\u00bbs\u00abrup\u00bbc\u00abjjq\u00bbz\u00abpfg\u00bbwsrpcjqzpgwsrpcjqzpgwsrpcj", "ref_code": "def main_solution(x):\n    return func_20(func_15('wkujf'), func_1(x, 4))", "funcname": "main_solution"}
rule