字符串对比，100%通过！！！

解题思路:

注意事项:

参考代码:

a = input()

b = input()

if len(a) != len(b):

    print(1)

elif a == b:

    print(2)

elif a.upper() ==b.upper():

    print(3)

elif len(a) == len(b) and a.upper() != b.upper():

    print(4)