You are given a code:

def main_solution(x):
    return func_20(('ydt' + x), func_15('tkpq'))

Can you predict the output of `main_solution("bmktqsgv")` 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": "bmktqsgv"}, "ref_output": "y\u00abdtt\u00bbb\u00abmkk\u00bbt\u00abqps\u00bbg\u00abvq\u00bb", "ref_code": "def main_solution(x):\n    return func_20(('ydt' + x), func_15('tkpq'))", "funcname": "main_solution"}
rule