You are given a code:

def main_solution(x):
    return (func_13('hxzrjm', '_') + func_5('nltge', 'whe'))

Can you predict the output of `main_solution("fvzmqnxzn")` 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": "fvzmqnxzn"}, "ref_output": "h_x_z_r_j_mwhenltge", "ref_code": "def main_solution(x):\n    return (func_13('hxzrjm', '_') + func_5('nltge', 'whe'))", "funcname": "main_solution"}
rule