You are given a code:

def main_solution(x):
    return func_20(func_13('kngrt', '-'), func_5('fuee', 'qbt'))

Can you predict the output of `main_solution("vvta")` 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": "vvta"}, "ref_output": "kq-bnt-fgu-ere-t", "ref_code": "def main_solution(x):\n    return func_20(func_13('kngrt', '-'), func_5('fuee', 'qbt'))", "funcname": "main_solution"}
rule