You are given a code:

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

Can you predict the output of `main_solution("fhyqrztts")` 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": "fhyqrztts"}, "ref_output": "f-h-y-q-r-z-t-t-s\u00abo\u00bb\u00abv\u00bb\u00abl\u00bb", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_15('ovl'))", "funcname": "main_solution"}
rule