You are given a code:

def main_solution(x):
    return func_13(('dos' + 'xroai'), '-')

Can you predict the output of `main_solution("yyq")` 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": "yyq"}, "ref_output": "d-o-s-x-r-o-a-i", "ref_code": "def main_solution(x):\n    return func_13(('dos' + 'xroai'), '-')", "funcname": "main_solution"}
rule