import javax.swing.JOptionPane;

public class Tangjifengshu {
    public static void main(String[] s)
    {
        int numberstudents=0;
        int[] scores;
        int i=0;
        int best=0;
        char grade='0';
        String numberstudentsString=JOptionPane.showInputDialog(null,
                "Please enter number of students:","软件班级",
                JOptionPane.QUESTION_MESSAGE);
        numberstudents=Integer.parseInt(numberstudentsString);
        scores=new int[numberstudents];
        for( i=0;i <scores.length;i++)
        { 
            String scoreString=JOptionPane.showInputDialog(null,"Please enter a score","软件班级",JOptionPane.QUESTION_MESSAGE);
            scores[i]=Integer.parseInt(scoreString);
            if(scores[i]>best)
                    best=scores[i];
        }
        
        String output=" ";
        int []count;
        count =new int[5];
                                 
        for( i=0;i <scores.length;i++)
        {        
                if(scores[i]>=best-10){
                    grade='A';
                    count[0]++;
                }                                                                  
                else if(scores[i]>=best-20){
                    grade='B';
                    count[1]++;
                }                                              
                else if(scores[i]>=best-30){
                    grade='C';
                    count[2]++;
                }                                                
                else if(scores[i]>=best-40){
                    grade='D';
                    count[3]++;
                }
                else{
                    grade='E';
                    count[4]++;
                    }                     
                output +="Studets  "+(i+1)+"  score is   "+scores[i]+"  and grade is   "+grade+  "\n";
                                         
                                                 
         }
        char c='A';
        for (int j = 0; j < count.length; j++) {
            output+="\n"+(c++)+":  "+count[j];
        }
        JOptionPane.showMessageDialog(null,output,"软件班级",
                JOptionPane.INFORMATION_MESSAGE);
        
          }
    }