You are given a code:

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

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