You are given a code:

def main_solution(x):
    return (func_15('nxtpq') + func_19('uhn', 3))

Can you predict the output of `main_solution("joanzybis")` 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": "joanzybis"}, "ref_output": "\u00abn\u00bb\u00abx\u00bb\u00abt\u00bb\u00abp\u00bb\u00abq\u00bbuhn", "ref_code": "def main_solution(x):\n    return (func_15('nxtpq') + func_19('uhn', 3))", "funcname": "main_solution"}
rule