You are given a code:

def main_solution(x):
    return func_13(func_22('bhivjh'), '_')

Can you predict the output of `main_solution("rvq")` 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": "rvq"}, "ref_output": "b_h_i_v_j_h", "ref_code": "def main_solution(x):\n    return func_13(func_22('bhivjh'), '_')", "funcname": "main_solution"}
rule