You are given a code:

def main_solution(x):
    return func_9(func_13('lttbns', '-'))

Can you predict the output of `main_solution("iekxeyitj")` 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": "iekxeyitj"}, "ref_output": "l-t-t-b-n-ss-n-b-t-t-l", "ref_code": "def main_solution(x):\n    return func_9(func_13('lttbns', '-'))", "funcname": "main_solution"}
rule