You are given a code:

def main_solution(x):
    return func_4(('bzyvt' + 'zrn'))

Can you predict the output of `main_solution("dbzjiani")` 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": "dbzjiani"}, "ref_output": "bzyvtzrn", "ref_code": "def main_solution(x):\n    return func_4(('bzyvt' + 'zrn'))", "funcname": "main_solution"}
rule