You are given a code:

def main_solution(x):
    return (func_13(x, '-') + func_22('vupwnq'))

Can you predict the output of `main_solution("nvoikjgww")` 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": "nvoikjgww"}, "ref_output": "n-v-o-i-k-j-g-w-wvupwnq", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_22('vupwnq'))", "funcname": "main_solution"}
rule