Input

public class Main
{
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;

    static String next() throws IOException
    {
        while(st == null || !st.hasMoreTokens())
            st = new StringTokenizer(br.readLine());
        return st.nextToken();
        //return Integer.parseInt(st.nextToken());
    }

    public static void main(String[] args) throws IOException
    {
        String s = next();
    }
}

output

//1
static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

//2
bw.write(i - n +" ");

//3
bw.flush();