You are given a code:

def main_solution(x):
    return func_13(('wiq' + x), '_')

Can you predict the output of `main_solution("bwlzcnvio")` 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": "bwlzcnvio"}, "ref_output": "w_i_q_b_w_l_z_c_n_v_i_o", "ref_code": "def main_solution(x):\n    return func_13(('wiq' + x), '_')", "funcname": "main_solution"}
rule