You are given a code:

def main_solution(x):
    return (func_13('hjwrv', '_') + func_15('fvvbiu'))

Can you predict the output of `main_solution("cxg")` 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": "cxg"}, "ref_output": "h_j_w_r_v\u00abf\u00bb\u00abv\u00bb\u00abv\u00bb\u00abb\u00bb\u00abi\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return (func_13('hjwrv', '_') + func_15('fvvbiu'))", "funcname": "main_solution"}
rule