def huiwen(s1):
for i in range(len(s1)/2):
if s1[i] != s1[len(s1)-1-i]:
return False
return True
if __name__ == '__main__':
s = "wewfwewfwfwfwfwfwfwf"
maxlen= 1
for i in range(len(s)-1):
for j in range(len(s)):
if huiwen(s[i:j]) and j-i > maxlen:
maxlen=j-i
shuiwen = s[i:j]
print shuiwen

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