public static String happyLadybugs(String b) {
        String[] bugArr = b.split("");
        if(b.contains("_")){
            Arrays.sort(bugArr);
        }
        bugArr = Arrays.stream(bugArr)
                .filter(s -> !s.equals("_"))
                .toArray(String[]::new);
        boolean isPresent = false;

        if(bugArr.length == 0){
            return "YES";
        }

        if(bugArr.length > 1){
            if(!bugArr[0].equalsIgnoreCase(bugArr[1])
                    || !bugArr[bugArr.length-1].equalsIgnoreCase(bugArr[bugArr.length-2])){
                return "NO";
            }
            for(int i=1; i<bugArr.length-1; i++){
                String currentElement = bugArr[i];
                if(currentElement.equals(bugArr[i-1]) || currentElement.equals(bugArr[i+1])){
                    isPresent = true;
                }else{
                    isPresent = false;
                    break;
                }
            }
        }

        return isPresent ? "YES" : "NO";
    }