求python大神看看，我这语法哪里错了，怎么改？？

#py.复习

fenshu = int(input())

if 100>=fenshu>=90:

    print("A")

elif 90>fenshu>=80:

    print("B")

elif 80>fenshu>=70:

    print ("C")

elif 70>fenshu>=60:

    print("D")

elif 60>fenshu>=0:

    print("pass")

else :

    print ("输入格式不正确")