You are given a code:

def main_solution(x):
    return func_20(func_23('brv', 3), func_13(x, '_'))

Can you predict the output of `main_solution("cyhijqilkr")` 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": "cyhijqilkr"}, "ref_output": "bcr_vy1_h_i_j_q_i_l_k_r", "ref_code": "def main_solution(x):\n    return func_20(func_23('brv', 3), func_13(x, '_'))", "funcname": "main_solution"}
rule