python实践有人能帮帮我吗

n=int(inut())
if 0<=n<=59:
    print("E等！")
elif 60<=n<=69:
    print("D等！")
elif 70<=n<=79:
    print("C等！")
elif 80<=n<=89:
    print("B等！")
elif 90<=n<=100:
    print("A等！")