void setup() {
  // Setup the digital pin 0-10 as OUTPUT pins using a for loop
  Serial.begin(9600);
}
int j=65;
char Grade='A';
void loop() {
  // put your main code here, to run repeatedly:
  
 switch (Grade){
       case 'A':
    Serial.println("Excelent");
    break;
    case 'B':
    Serial.println("Best");
    break;
    case 'C':
    Serial.println("Good");
    break;
  default:
    Serial.println("No match");
    break;
 }

 delay(1500);
 
 if (j>69) {j=65;}
 else {j++;
  Grade=j;}
 
}