You are given a code:

def main_solution(x):
    return func_20(func_5('tybl', 'dwww'), func_15('ojd'))

Can you predict the output of `main_solution("rnbvudt")` 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": "rnbvudt"}, "ref_output": "d\u00abwow\u00bbw\u00abtjy\u00bbb\u00abld\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5('tybl', 'dwww'), func_15('ojd'))", "funcname": "main_solution"}
rule