You are given a code:

def main_solution(x):
    return func_20(func_15('cyf'), func_5('sosbvu', 'ritr'))

Can you predict the output of `main_solution("ltaagkrb")` 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": "ltaagkrb"}, "ref_output": "\u00abrci\u00bbt\u00abrys\u00bbo\u00absfb\u00bbvu", "ref_code": "def main_solution(x):\n    return func_20(func_15('cyf'), func_5('sosbvu', 'ritr'))", "funcname": "main_solution"}
rule