You are given a code:

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

Can you predict the output of `main_solution("memn")` 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": "memn"}, "ref_output": "m-e-m-n-a-j-j-a", "ref_code": "def main_solution(x):\n    return func_13((x + 'ajja'), '-')", "funcname": "main_solution"}
rule