Grade System...

 

a = int (input("Enter The Marks : "))
if a>100 :
    print ("Wrong")
elif 90<=a<=100 :
    grade = "AA"
elif a>=80 :
    grade = "A+"
elif a>=70 :
    grade = "A"
elif a>=40 :
    grade = "B"
elif a>=35 :
    grade = "C"
else:
    grade = "Fail"
   
print ("Your Grade is : "+grade)