import java.io.*;
import java.util.*;

public class Main {

    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;

	public static void main(String[] args) throws IOException {



	}

	static String next () throws IOException {
        while (st == null || ! st.hasMoreTokens())
            st = new StringTokenizer(br.readLine().trim());
        return st.nextToken();
    }
    static long readLong () throws IOException {
        return Long.parseLong(next());
    }
    static int readInt () throws IOException {
        return Integer.parseInt(next());
    }
    static double readDouble () throws IOException {
        return Double.parseDouble(next());
    }
    static char readCharacter () throws IOException {
        return next().charAt(0);
    }
    static String readLine () throws IOException {
        return br.readLine().trim();
    }

}