题解 | #密码截取#

import sys

for pom_line in sys.stdin:
    pom_line = pom_line.strip()
    odd, enev = [1] * len(pom_line), [0] * len(pom_line)
    for index, le in enumerate(pom_line):
        jv = 1
        try:
            while pom_line[index - jv] == pom_line[index + jv]:
                odd[index] += 2
                jv += 1
        except:
            continue
    for index, le in enumerate(pom_line):
        jv = 1
        try:
            if pom_line[index] == pom_line[index + 1]:
                enev[index] += 2
                while pom_line[index - jv] == pom_line[index + 1 + jv]:
                    enev[index] += 2
                    jv += 1
        except:
            continue
    print(max(max(odd),max(enev)))