You are given a code:

def main_solution(x):
    return func_4(func_20('kas', 'jehrg'))

Can you predict the output of `main_solution("xeetkkmpui")` 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": "xeetkkmpui"}, "ref_output": "kjaeshrg", "ref_code": "def main_solution(x):\n    return func_4(func_20('kas', 'jehrg'))", "funcname": "main_solution"}
rule