for i in range(5): 
    # name[array] (string) (0, 1, 2, 3, 4, 5)
    name = input("Enter your name: ")
    # score[array] (float)
    score = eval(input("Enter your score: "))

    if score > 100:
        print("Please enter a new score again")
    elif score >= 80 and score < 100:
        print("Grade A")
    elif score >= 70:
        print("Grade B")
    elif score >= 60:
        print("Grade C")
    elif score >= 50:
        print("Grade D")
    elif score < 50 and score >= 0:
        print("Grade F")
    else:
        print("Please enter a new score again")