Chain Relation.py

num = int(input("Enter Exam Number :: "))

if 80 <= num <= 100 :
    print("A+")
elif 70 <= num <= 79 :
    print("A")
elif 60 <= num <= 69 :
    print("A-")
elif 50 <= num <= 59 :
    print("B")
elif 40 <= num <= 49 :
    print("C")
elif 33 <= num <= 39 :
    print("D")
else :
    print("F")