You are given a code:

def main_solution(x):
    return func_20(func_23('cfvfm', 1), func_13(x, '_'))

Can you predict the output of `main_solution("qletattypg")` 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": "qletattypg"}, "ref_output": "cqf_vlf_me1_t_a_t_t_y_p_g", "ref_code": "def main_solution(x):\n    return func_20(func_23('cfvfm', 1), func_13(x, '_'))", "funcname": "main_solution"}
rule