/* 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 values[] = {"nG5wnyPVNxS6PbbDNNbRsK5zanG94Et6Q4y74","GgQoDWqP7KtxXeePyyebu5EnNp8XxPC1odeNv","GgQoDWqP7KtxXeePyyebu5EnNp8XxPC1o12NN"};
		for (String element : values)
    		System.out.println(element.replaceAll("\\w(?=\\w*\\w{4}$)", "X"));
	}
}

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