public static int solution(String S) {

        for(int i=1; i<S.length();i++){
            String left = S.substring(0,i);
            String right = S.substring(i,S.length());

            System.out.print("On left:"+ numberChars(left,'('));
            System.out.println("  .On right:"+ numberChars(right,')'));

            int openOnLeft= numberChars(left,'(');
            int closedOnRight= numberChars(right,')');

            if((openOnLeft-closedOnRight)==0){
                System.out.println("Found on:"+i);
                return i;
            }
        }

        return 0;
    }

    private static int numberChars(String str, char find){
        int numFound=0;

        for(char c:str.toCharArray()){
            if(c== find)
            numFound++;
        }
       return numFound;
    }