You are given a code:

def main_solution(x):
    return func_20(('ieotb' + 'ivusa'), func_22('vku'))

Can you predict the output of `main_solution("kac")` 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": "kac"}, "ref_output": "ivekotbivusa", "ref_code": "def main_solution(x):\n    return func_20(('ieotb' + 'ivusa'), func_22('vku'))", "funcname": "main_solution"}
rule