You are given a code:

def main_solution(x):
    return func_13(func_5(x, 'pr'), '-')

Can you predict the output of `main_solution("raotbusjka")` 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": "raotbusjka"}, "ref_output": "p-r-r-a-o-t-b-u-s-j-k-a", "ref_code": "def main_solution(x):\n    return func_13(func_5(x, 'pr'), '-')", "funcname": "main_solution"}
rule