grades

#Grade checker

mark = int(input("Please enter your mark "))
if mark >= 69:
    print("you have achieved a grade 9")
elif mark >= 63:
    print("you have achieved a grade 8")
elif mark >= 57:
    print("you have achieved a grade 7")
elif mark >= 50:
    print("you have achieved a grade 6")
elif mark >= 43:
    print("you have achieved a grade 5")
elif mark >= 36:
    print("you have achieved a grade 4")
elif mark >= 28:
    print("you have achieved a grade 3")
elif mark >= 18:
    print("you have achieved a grade 2")
elif mark >= 10:
    print("you have achieved a grade 1")
else:
    print("You have not achieved a grade")