Letter grade

import java.util.Scanner;

public class letterGrade {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);

    char grade = scan.next().charAt(0);
    
    int pass = 0 , fail = 0;
    while(grade>='A'&& grade<='F'&& grade!='E'){
    if(grade == 'F')
    fail++;
    else
    pass++;
    
    System.out.println("Enter a letter grade : " + grade);
      grade = scan.next().charAt(0);

    }   
    
    double percentFail = (fail*100/(1.0*pass+fail));
    System.out.println("The fail percent is % "+ Math.round(percentFail*100.0)/100.0);
    

}
}