# 410802075 東華ＧＰＡ

score = int(input("score: "))
if 100 >= score >= 90:
    print('Grade is: A+')
elif 89 >= score >= 85:
    print('Grade is: A')
elif 80 >= score >= 84:
    print('Grade is: A-')
elif 79 >= score >= 77:
    print('Grade is: B+')
elif 76 >= score >= 73:
    print('Grade is: B')
elif 72 >= score >= 70:
    print('Grade is: B-')
elif 69 >= score >= 67:
    print('Grade is: C+')
elif 66 >= score >= 63:
    print('Grade is: C')
elif 62 >= score >= 60:
    print('Grade is: C-')
elif 59 >= score >= 50:
    print('Grade is: D')
elif score <50:
    print('Grade is: E')