You are given a code:

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

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