You are given a code:

def main_solution(x):
    return (func_3('zgosa') + func_15(x))

Can you predict the output of `main_solution("agrnk")` 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": "agrnk"}, "ref_output": "agosz\u00aba\u00bb\u00abg\u00bb\u00abr\u00bb\u00abn\u00bb\u00abk\u00bb", "ref_code": "def main_solution(x):\n    return (func_3('zgosa') + func_15(x))", "funcname": "main_solution"}
rule