You are given a code:

def main_solution(x):
    return func_20(func_13(x, '-'), func_15('dif'))

Can you predict the output of `main_solution("nuescxm")` 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": "nuescxm"}, "ref_output": "n\u00ab-du\u00bb-\u00abei-\u00bbs\u00ab-fc\u00bb-x-m", "ref_code": "def main_solution(x):\n    return func_20(func_13(x, '-'), func_15('dif'))", "funcname": "main_solution"}
rule