Python成绩等级评定代码

有熟练Python的朋友可以帮我看看这个代码还要补充什么或是哪里错了，我提交的时候就对了80%实在看不出来到底还有哪里错了

score = int(input().strip())
if 0 <= score <= 59:
    print("差")
if 60 <= score <= 74:
    print("中")
if 75 <= score <= 89:
    print("良")
if 90 <= score <= 100:
    print("优")

scores = input().split("\n")
list1 = []
for i in scores:
    score = int(i)
    if score < 60:
        list1.append("差")
    elif score < 75:
        list1.append("中"))
    elif score < 90:
        list1.append("良")
    else:
        list1.append("优")
for k in list1:
    print(k)