You are given a code:

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

Can you predict the output of `main_solution("fjjikcp")` 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": "fjjikcp"}, "ref_output": "gtuprdmwnmf-j-j-i-k-c-p", "ref_code": "def main_solution(x):\n    return (('gtuprd' + 'mwnm') + func_13(x, '-'))", "funcname": "main_solution"}
rule