2 determines whether a character input between a-zA-Z. If yes, az or AZ belongs and outputs the value.

public static void main(String[] args) {

      System.out.println ( "Please enter a string");

      Scanner scanner=new Scanner(System.in);

      String string=scanner.nextLine();

      char c=string.charAt(0);

          if(c>='a'&&c<='z') {

                System.out.println ( "belonging az, the input values ​​are:" + c);

          }else if(c>='A'&&c<='Z') {

                System.out.println ( "belonging AZ, input values:" + c);

          }else {

                System.out.println ( "Please enter a valid character");

          }

     scanner.close();

}