You are given a code:

def main_solution(x):
    return (('twkkc' + 'oju') + func_15('sxtqou'))

Can you predict the output of `main_solution("fmjet")` 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": "fmjet"}, "ref_output": "twkkcoju\u00abs\u00bb\u00abx\u00bb\u00abt\u00bb\u00abq\u00bb\u00abo\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return (('twkkc' + 'oju') + func_15('sxtqou'))", "funcname": "main_solution"}
rule