You are given a code:

def main_solution(x):
    return func_20(func_4('zxjzp'), func_15('vvoe'))

Can you predict the output of `main_solution("qdneljryst")` 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": "qdneljryst"}, "ref_output": "z\u00abxvj\u00bbz\u00abpv\u00bb\u00abo\u00bb\u00abe\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_4('zxjzp'), func_15('vvoe'))", "funcname": "main_solution"}
rule