You are given a code:

def main_solution(x):
    return (func_23('mbjaw', 1) + func_13(x, '_'))

Can you predict the output of `main_solution("beljbuqsiw")` 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": "beljbuqsiw"}, "ref_output": "mbjaw1b_e_l_j_b_u_q_s_i_w", "ref_code": "def main_solution(x):\n    return (func_23('mbjaw', 1) + func_13(x, '_'))", "funcname": "main_solution"}
rule