You are given a code:

def main_solution(x):
    return func_20(func_15('yrub'), ('trorj' + 'tgzzj'))

Can you predict the output of `main_solution("pdvrjsazl")` 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": "pdvrjsazl"}, "ref_output": "\u00abtyr\u00bbo\u00abrrj\u00bbt\u00abguz\u00bbz\u00abjb\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15('yrub'), ('trorj' + 'tgzzj'))", "funcname": "main_solution"}
rule