You are given a code:

def main_solution(x):
    return (func_15('auzi')).upper()

Can you predict the output of `main_solution("njanlne")` 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": "njanlne"}, "ref_output": "\u00abA\u00bb\u00abU\u00bb\u00abZ\u00bb\u00abI\u00bb", "ref_code": "def main_solution(x):\n    return (func_15('auzi')).upper()", "funcname": "main_solution"}
rule