You are given a code:

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

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