import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
 
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String regex = "^(\\d{5})(?:[-\\h]+(\\d{4}))?\\h+$";
        String string = "12345-1234 \n"
                + "12345 1234 \n"
                + "12345 ";
 
        Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
        Matcher matcher = pattern.matcher(string);
        System.out.println(matcher.replaceAll("$1$2"));
	}
}

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