/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/* 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 test = "aaaabbbccccaaddddcfggghhhh";
    	String replaced = test.replaceAll("(.)\\1+","$1");
        System.out.println("Found Duplicates: " + (test.length() - replaced.length()));
        System.out.println("Replaced String:" + replaced);
    }
 
}

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