You are given a code:

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

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