public class p178_4
{
  public static void main(String[] args)
  {
  	int grade=0;
  	
  	System.out.println("Please enter the exam scores one each line.Input -1 to end.");
  	
  	do{
  	   int grade=SavitchIn.readLine();
  	
  	   if(grade<0||grade>100){
     	System.out.println("Sorry!There must be something wrong!"+
  	    "There shouldn't be any grade greater than 100 or smaller than 0."+
     	"Please try again:");
  	    grade=SavitchIn.readLine();
  		  	}
    
    char check=order(grade);
    switch(check){
    	case 'A':
      	   System.out.println(grade: "A");
      	   break;
      	case 'B':
      	   System.out.println(grade: "B");
      	   break;
      	case 'C':
      	   System.out.println(grade: "C");
      	   break;
      	case 'D':
      	   System.out.println(grade: "D");
      	   break;
      	case 'E':
      	   System.out.println(grade: "E");
      }
     }
     while (grade!=-1);
  }
  public static char order(int grade)
  {
  	     if(grade<=100&&grade>=90)
  		     retern A;
  	   	else if(grade<=89&&grade>=80)
  		     retern B;
  		else if(grade<=79&&grede>=70)
  		     retern C;
        else if(grade<=69&&grade>=60)
  	    	 retern D;
  	    else
  		     retern E;
  }
}