You are given a code:

def main_solution(x):
    return (func_13('quxwjk', '|') + ('ffga' + 'gactwy'))

Can you predict the output of `main_solution("arvkm")` 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": "arvkm"}, "ref_output": "q|u|x|w|j|kffgagactwy", "ref_code": "def main_solution(x):\n    return (func_13('quxwjk', '|') + ('ffga' + 'gactwy'))", "funcname": "main_solution"}
rule