You are given a code:

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

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