import java.util.*;
import java.util.regex.*;
import java.lang.*;
import java.io.*;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String longString = "Amal Kamal Jamal Amitha Farook Amani Tom Adele George Ariana";
	    String pattern = "(?i)(?<!\\S)a[a-z]{4,}(?!\\S)";
	    Pattern checkRegex = Pattern.compile(pattern);
	    Matcher regexMatcher = checkRegex.matcher(longString);
	    while (regexMatcher.find()) {
	        System.out.println(regexMatcher.start() + " : " + regexMatcher.group());
	    }
	}
}

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