BC57 四季

思路：

step1：输入字符，切割后两位并转换为int型；

step2：按照要求打印输出结果；

代码如下：

n = input()
s = int(n[-2]+n[-1])
if s == 3 or s == 4 or s == 5:
    print('spring')
elif s == 6 or s == 7 or s == 8:
    print('summer')
elif s == 9 or s == 10 or s == 11:
    print('autumn')
elif s == 12 or s == 1 or s == 2:
    print('winter')