You are given a code:

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

Can you predict the output of `main_solution("nzc")` 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": "nzc"}, "ref_output": "\u00abu\u00bb\u00abp\u00bb\u00abe\u00bb\u00abx\u00bb\u00abk\u00bbi-f-t", "ref_code": "def main_solution(x):\n    return (func_15('upexk') + func_13('ift', '-'))", "funcname": "main_solution"}
rule