You are given a code:

def main_solution(x):
    return func_5(('jza' + 'ptz'), 'kevj')

Can you predict the output of `main_solution("fhs")` 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": "fhs"}, "ref_output": "kevjjzaptz", "ref_code": "def main_solution(x):\n    return func_5(('jza' + 'ptz'), 'kevj')", "funcname": "main_solution"}
rule