/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner scan = new Scanner(System.in);
		scan.useDelimiter("\\n");
		scan.forEachRemaining(a -> {
			StringBuilder sb = new StringBuilder();
			a.chars().forEach(ch -> {
				boolean digit = Character.isDigit(ch);
				sb.append(sb.length() % 4 == 3 && digit ? "-" : "");
				sb.append(digit ? (char) ch : "");
			});
			System.out.println(sb);
		});
		scan.close();
	}
}