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 = "^[^\\sa-z](?:[^a-z\\r\\n]{0,16}[^\\sa-z])?$";
        String string = "T\n"
                + "TEST\n"
                + "Test\n"
                + "THIS IS 123-345 T\n"
                + "THIS IS 123-345 \n"
                + "THIS IS 123-345\n"
                + "THIS IS 123-345 TE\n"
                + "THIS IS 123-345 TEE";
 
        Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
        Matcher matcher = pattern.matcher(string);
 
        while (matcher.find()) {
            System.out.println(matcher.group(0));
        }
	}
}

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