/* 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
	{
		String s = "       YES      leading spaces        are valid,    problemsetters are         evillllll";
		String[] splitString = (s.replaceAll("^\\W+", "").split("[\\s!,?._'@]+"));
        System.out.println(splitString.length);
        for (String string : splitString) {
        	System.out.println(string);
        }
	}
}

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