Pangram için yardım

public class Pangram 
  { 
   
      public static void main(String[] args)  
      { 
          String user; 
          int size, x = 0; 
            
          Scanner scan = new Scanner (System.in); 
          System.out.println("Enter your sentences: "); 
          user = scan.next(); 
          size = user.length(); 
          for(char a = 'A'; a<'Z'; a++) 
          { 
              do 
              { 
                  if(user.charAt(x) == a) 
                      System.out.println( "This senteces has " + a + "\n"); 
                   
                  x++; 
              } 
              while(x!=size); 
          } 
      } 
  }