class Input_Output 
    {
        public static void main(String args[]) throws IOException
        {  
            string str;
            BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));
            do
            {
                str = (char) obj.readLine();
         System.out.print(str);
            } while(!str.equals("strong"));
        }
    }

    class output
    {
        public static void main(String args[])
        { 
             StringBuffer c = new StringBuffer("Hello");
             StringBuffer c1 = new StringBuffer(" World");
             c.append(c1);
             System.out.println(c);
        }
    }

    class output
    {
        public static void main(String args[])
        {
            String a="hello i love java";
            System.out.println(indexof('i')+" "+indexof('o')+" "+lastIndexof('i')+" "+lastIndexof('o') ));
        }
    }

    class output
    {
        public static void main(String args[])
        {
            char c[]={'a','1','b',' ','A','0'];
            for (int i = 0; i < 5; ++i)
            {
         if(Character.isDigit(c[i]))
                    System.out.println(c[i]" is a digit");
                if(Character.isWhitespace(c[i]))
                   System.out.println(c[i]" is a Whitespace character");
                if(Character.isUpperCase(c[i]))
                   System.out.println(c[i]" is an Upper case Letter");
                if(Character.isUpperCase(c[i]))
                   System.out.println(c[i]" is a lower case Letter");
                i = i + 3;
            }
        }
    }