m = int(input("Please enter your marks :"))
if(m>=91):
    print("You got a  S Grade!!!!")
elif(m>=81):
    print("You got A Grade")
elif(m>=71):
    print("You got B grade")
elif(m>=61):
    print("You got C grade")
elif(m>51):
    print("You got D grade")
else:
    print("Sorry you are failed")
