String input = "sysdate+232-324+324 am pula mare sysdate+2323-424-423";

        while (input.indexOf("sysdate") != -1) {
            int start = input.indexOf("sysdate");
            int end = input.indexOf(" ", start);
            if(end == -1)
                end = input.length();
            String sysdate = input.substring(start, end);
            SumaNumar(sysdate);


            input = input.substring(end, input.length());

            System.out.println("Sysdate: " + sysdate);
        }