You are given a code:

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

Can you predict the output of `main_solution("nhwrnvayko")` 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": "nhwrnvayko"}, "ref_output": "n-h-w-r-n-v-a-y-k-o-l-s-f-w-o-q", "ref_code": "def main_solution(x):\n    return func_13((x + 'lsfwoq'), '-')", "funcname": "main_solution"}
rule