You are given a code:

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

Can you predict the output of `main_solution("dwnr")` 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": "dwnr"}, "ref_output": "u|x|d|g|k|a|r|h|x|m|i", "ref_code": "def main_solution(x):\n    return func_13(('uxdgka' + 'rhxmi'), '|')", "funcname": "main_solution"}
rule