score = input("输入分数：")
score =int(score)
if score >= 80 and score <100:
    print("优秀")
elif score >= 70 and score < 80:
    print("良好")
elif score >= 60 and score < 70:
    print("及格")
elif score >=0 and score <=60:
    print("不及格")                           else :
    print("输入出错！")