You are given a code:

def main_solution(x):
    return (('rzc' + 'hjun') + func_4('ffteuo'))

Can you predict the output of `main_solution("arzsyzj")` 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": "arzsyzj"}, "ref_output": "rzchjunffteuo", "ref_code": "def main_solution(x):\n    return (('rzc' + 'hjun') + func_4('ffteuo'))", "funcname": "main_solution"}
rule