You are given a code:

def main_solution(x):
    return (func_19('yrtb', 1) + func_9('gud'))

Can you predict the output of `main_solution("pzkih")` 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": "pzkih"}, "ref_output": "rtbyguddug", "ref_code": "def main_solution(x):\n    return (func_19('yrtb', 1) + func_9('gud'))", "funcname": "main_solution"}
rule