/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
/* 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 n="1 21 16 17 9 8 22 20 10";
    Pattern p=Pattern.compile("\\b(1[0-9]|[0-9])\\b");
    Matcher m=p.matcher(n);
    while(m.find())
        System.out.println(n.substring(m.start(),m.end()));
    }
 
}

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