You are given a code:

def main_solution(x):
    return (func_15('felaz') + func_13(x, '-'))

Can you predict the output of `main_solution("mnna")` 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": "mnna"}, "ref_output": "\u00abf\u00bb\u00abe\u00bb\u00abl\u00bb\u00aba\u00bb\u00abz\u00bbm-n-n-a", "ref_code": "def main_solution(x):\n    return (func_15('felaz') + func_13(x, '-'))", "funcname": "main_solution"}
rule