You are given a code:

def main_solution(x):
    return (func_5(x, 'cqs') + ('dkstw' + 'kghha'))

Can you predict the output of `main_solution("atubj")` 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": "atubj"}, "ref_output": "cqsatubjdkstwkghha", "ref_code": "def main_solution(x):\n    return (func_5(x, 'cqs') + ('dkstw' + 'kghha'))", "funcname": "main_solution"}
rule