第一题：StringBuilder sb = new StringBuilder();         for (int i = s.length()-1; i >0; i--) {             if(s.charAt(i)==' &(5528)#39;){                 if(sb.length()==0){                     continue;                 }else{                     break;                 }             }else{                 sb.append(s.charAt(i));             }         }         System.out.println(sb.length());