You are given a code:

def main_solution(x):
    return func_13(('grn' + x), '|')

Can you predict the output of `main_solution("lkmxlg")` 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": "lkmxlg"}, "ref_output": "g|r|n|l|k|m|x|l|g", "ref_code": "def main_solution(x):\n    return func_13(('grn' + x), '|')", "funcname": "main_solution"}
rule