You are given a code:

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

Can you predict the output of `main_solution("rlwkpixkrx")` 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": "rlwkpixkrx"}, "ref_output": "r-l-w-k-p-i-x-k-r-x-z-u-r-n-s-z", "ref_code": "def main_solution(x):\n    return func_13((x + 'zurnsz'), '-')", "funcname": "main_solution"}
rule