You are given a code:

def main_solution(x):
    return ('cixs' + 'xlkhmo')

Can you predict the output of `main_solution("okn")` 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": "okn"}, "ref_output": "cixsxlkhmo", "ref_code": "def main_solution(x):\n    return ('cixs' + 'xlkhmo')", "funcname": "main_solution"}
rule