/* 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[] a = {"a","a","b","c","d"};
String[] b = {"b","b", "c"};
 
		TreeSet set = new TreeSet(Arrays.asList(a));
set.removeAll(Arrays.asList(b));
System.out.println(Arrays.toString(set.toArray()));
	}
}

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