BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        int choice = 0;
        try {
            while (choice != -1) {
                String line = stdin.readLine();
                choice = Integer.parseInt(line);
                if (choice >= 0) System.out.println(choice);
            }
        }
        catch (IOException e) {
            System.err.println("IOException : "+e);
        }

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