You are given a code:

def main_solution(x):
    return func_20(func_15(x), func_23('hgoqi', 2))

Can you predict the output of `main_solution("ydtkjoplsu")` 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": "ydtkjoplsu"}, "ref_output": "\u00abhyg\u00bbo\u00abqdi\u00bb1\u00abt\u00bb\u00abk\u00bb\u00abj\u00bb\u00abo\u00bb\u00abp\u00bb\u00abl\u00bb\u00abs\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_15(x), func_23('hgoqi', 2))", "funcname": "main_solution"}
rule