You are given a code:

def main_solution(x):
    return (func_9('gmpu') + func_15('hktsoj'))

Can you predict the output of `main_solution("ofs")` 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": "ofs"}, "ref_output": "gmpuupmg\u00abh\u00bb\u00abk\u00bb\u00abt\u00bb\u00abs\u00bb\u00abo\u00bb\u00abj\u00bb", "ref_code": "def main_solution(x):\n    return (func_9('gmpu') + func_15('hktsoj'))", "funcname": "main_solution"}
rule