You are given a code:

def main_solution(x):
    return func_5('pul', 'yzk')

Can you predict the output of `main_solution("afqqveocbt")` 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": "afqqveocbt"}, "ref_output": "yzkpul", "ref_code": "def main_solution(x):\n    return func_5('pul', 'yzk')", "funcname": "main_solution"}
rule