You are given a code:

def main_solution(x):
    return (func_13(x, '-') + func_3('rrwd'))

Can you predict the output of `main_solution("univttsumy")` 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": "univttsumy"}, "ref_output": "u-n-i-v-t-t-s-u-m-ydrrw", "ref_code": "def main_solution(x):\n    return (func_13(x, '-') + func_3('rrwd'))", "funcname": "main_solution"}
rule