You are given a code:

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

Can you predict the output of `main_solution("slonguknmv")` 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": "slonguknmv"}, "ref_output": "i-s-a-l-q-o-o-n-b-g-u-k-n-m-v", "ref_code": "def main_solution(x):\n    return func_13(func_20('iaqob', x), '-')", "funcname": "main_solution"}
rule