/* 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 regex = "(?m)^\\h*/\\*(?!((?!/\\*)[\\s\\S])*\\*/).*";
		String string = "aaaa\n"
		 + "aaa\n"
		 + "a\n"
		 + "aaaaa\n"
		 + "aaaaa\n"
		 + "aabab\n"
		 + "aaa, bb, ccc, ddd\n"
		 + "aaaabbcccddds";
		System.out.println(string.replaceAll("(?:(\\w)(?:\\1\\1)+|(\\w)\\2+)(?!\\1|\\2)", "$1"));
	}
}

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