You are given a code:

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

Can you predict the output of `main_solution("owtm")` 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": "owtm"}, "ref_output": "w_g_y_u_f_y_r_c_e_r_c", "ref_code": "def main_solution(x):\n    return func_13(('wgyufy' + 'rcerc'), '_')", "funcname": "main_solution"}
rule