You are given a code:

def main_solution(x):
    return func_20(func_20('ewvbd', 'dttih'), func_15('idbo'))

Can you predict the output of `main_solution("fvkdgga")` 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": "fvkdgga"}, "ref_output": "e\u00abdiw\u00bbt\u00abvdt\u00bbb\u00abibd\u00bbh\u00abo\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20('ewvbd', 'dttih'), func_15('idbo'))", "funcname": "main_solution"}
rule