You are given a code:

def main_solution(x):
    return func_5(func_5('vkx', 'cvl'), 'wua')

Can you predict the output of `main_solution("aar")` 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": "aar"}, "ref_output": "wuacvlvkx", "ref_code": "def main_solution(x):\n    return func_5(func_5('vkx', 'cvl'), 'wua')", "funcname": "main_solution"}
rule