You are given a code:

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

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