You are given a code:

def main_solution(x):
    return (func_13('fltohw', '_') + func_9('qzxojm'))

Can you predict the output of `main_solution("wfyrsepzb")` 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": "wfyrsepzb"}, "ref_output": "f_l_t_o_h_wqzxojmmjoxzq", "ref_code": "def main_solution(x):\n    return (func_13('fltohw', '_') + func_9('qzxojm'))", "funcname": "main_solution"}
rule