You are given a code:

def main_solution(x):
    return func_20(func_5(x, 'sgko'), func_15('fasxt'))

Can you predict the output of `main_solution("yneg")` 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": "yneg"}, "ref_output": "s\u00abgfk\u00bbo\u00abyan\u00bbe\u00abgs\u00bb\u00abx\u00bb\u00abt\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_5(x, 'sgko'), func_15('fasxt'))", "funcname": "main_solution"}
rule