You are given a code:

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

Can you predict the output of `main_solution("yisd")` 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": "yisd"}, "ref_output": "e\u00abbiy\u00bbe\u00abgbd\u00bbe\u00abbry\u00bbe\u00abgvd\u00bbe\u00abbgy\u00bbe\u00abgnd\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_1('ebyegd', 3), func_15('ibrvgn'))", "funcname": "main_solution"}
rule