You are given a code:

def main_solution(x):
    return func_20(func_1(x, 3), func_15('vtxtuo'))

Can you predict the output of `main_solution("bkqpeard")` 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": "bkqpeard"}, "ref_output": "b\u00abkvq\u00bbp\u00abeta\u00bbr\u00abdxb\u00bbk\u00abqtp\u00bbe\u00abaur\u00bbd\u00abbok\u00bbqpeard", "ref_code": "def main_solution(x):\n    return func_20(func_1(x, 3), func_15('vtxtuo'))", "funcname": "main_solution"}
rule