You are given a code:

def main_solution(x):
    return func_13(func_5(x, 'jyp'), '_')

Can you predict the output of `main_solution("qeihyokwu")` 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": "qeihyokwu"}, "ref_output": "j_y_p_q_e_i_h_y_o_k_w_u", "ref_code": "def main_solution(x):\n    return func_13(func_5(x, 'jyp'), '_')", "funcname": "main_solution"}
rule