Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

A. Antipalindrome

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputA string is a palindrome if it reads the same from the left to the right and from the right to the left. For example, the strings "kek", "abacaba", "r" and "papicipap" are palindromes, while the strings "abb" and "iq" are not.

A substring $$$s[l \ldots r]$$$ ($$$1 \leq l \leq r \leq |s|$$$) of a string $$$s = s_{1}s_{2} \ldots s_{|s|}$$$ is the string $$$s_{l}s_{l + 1} \ldots s_{r}$$$.

Anna does not like palindromes, so she makes her friends call her Ann. She also changes all the words she reads in a similar way. Namely, each word $$$s$$$ is changed into its longest substring that is not a palindrome. If all the substrings of $$$s$$$ are palindromes, she skips the word at all.

Some time ago Ann read the word $$$s$$$. What is the word she changed it into?

Input

The first line contains a non-empty string $$$s$$$ with length at most $$$50$$$ characters, containing lowercase English letters only.

Output

If there is such a substring in $$$s$$$ that is not a palindrome, print the maximum length of such a substring. Otherwise print $$$0$$$.

Note that there can be multiple longest substrings that are not palindromes, but their length is unique.

Examples

Input

mew

Output

3

Input

wuffuw

Output

5

Input

qqqqqqqq

Output

0

Note

"mew" is not a palindrome, so the longest substring of it that is not a palindrome, is the string "mew" itself. Thus, the answer for the first example is $$$3$$$.

The string "uffuw" is one of the longest non-palindrome substrings (of length $$$5$$$) of the string "wuffuw", so the answer for the second example is $$$5$$$.

All substrings of the string "qqqqqqqq" consist of equal characters so they are palindromes. This way, there are no non-palindrome substrings. Thus, the answer for the third example is $$$0$$$.

Codeforces (c) Copyright 2010-2018 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Jun/19/2018 15:11:24 (d3).

Desktop version, switch to mobile version.

User lists

Name |
---|