You are given a code:

def main_solution(x):
    return func_20(func_20(x, x), func_15(x))

Can you predict the output of `main_solution("vflgvsvrqp")` 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": "vflgvsvrqp"}, "ref_output": "v\u00abvvf\u00bbf\u00ablfl\u00bbg\u00abglv\u00bbv\u00absgs\u00bbv\u00abvvr\u00bbr\u00abqsq\u00bbp\u00abpv\u00bb\u00abr\u00bb\u00abq\u00bb\u00abp\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_20(x, x), func_15(x))", "funcname": "main_solution"}
rule