You are given a code:

def main_solution(x):
    return func_20(func_19('eiio', 3), func_15('kfqyxu'))

Can you predict the output of `main_solution("zgfyf")` 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": "zgfyf"}, "ref_output": "o\u00abeki\u00bbi\u00abf\u00bb\u00abq\u00bb\u00aby\u00bb\u00abx\u00bb\u00abu\u00bb", "ref_code": "def main_solution(x):\n    return func_20(func_19('eiio', 3), func_15('kfqyxu'))", "funcname": "main_solution"}
rule