题解 | #密码截取#

def spread(left,right,word):
    while left>=0 and right<=len(word)-1 and word[left]==word[right]:
        left-=1
        right+=1
    return len(word[left+1:right])

while True:
    try:
        res=0
        word=input()
        for i in range(len(word)):
            single=spread(i,i,word)
            if single>res:
                res=single
            ou=spread(i,i+1,word)
            if ou>res:
                res=ou
        print(res)
    except:
        break