You are given a code:

def main_solution(x):
    return func_9(func_20('lwjt', 'amfnja'))

Can you predict the output of `main_solution("krbbsxdleu")` 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": "krbbsxdleu"}, "ref_output": "lawmjftnjaajntfjmwal", "ref_code": "def main_solution(x):\n    return func_9(func_20('lwjt', 'amfnja'))", "funcname": "main_solution"}
rule