You are given a code:

def main_solution(x):
    return func_5('jqzqqt', 'vx')

Can you predict the output of `main_solution("nvkv")` 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": "nvkv"}, "ref_output": "vxjqzqqt", "ref_code": "def main_solution(x):\n    return func_5('jqzqqt', 'vx')", "funcname": "main_solution"}
rule