You are given a code:

def main_solution(x):
    return func_20(func_15('flngl'), func_5('dczopf', 'eav'))

Can you predict the output of `main_solution("yspnb")` 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": "yspnb"}, "ref_output": "\u00abefa\u00bbv\u00abdlc\u00bbz\u00abonp\u00bbf\u00abg\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('flngl'), func_5('dczopf', 'eav'))", "funcname": "main_solution"}
rule