You are given a code:

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

Can you predict the output of `main_solution("pglqokw")` 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": "pglqokw"}, "ref_output": "o_k_z_e_x_v_r_e_c", "ref_code": "def main_solution(x):\n    return func_13(('okzexv' + 'rec'), '_')", "funcname": "main_solution"}
rule