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F. Yet Another Substring Reverse

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputYou are given a string $$$s$$$ consisting only of first $$$20$$$ lowercase Latin letters ('a', 'b', ..., 't').

Recall that the substring $$$s[l; r]$$$ of the string $$$s$$$ is the string $$$s_l s_{l + 1} \dots s_r$$$. For example, the substrings of "codeforces" are "code", "force", "f", "for", but not "coder" and "top".

You can perform the following operation no more than once: choose some substring $$$s[l; r]$$$ and reverse it (i.e. the string $$$s_l s_{l + 1} \dots s_r$$$ becomes $$$s_r s_{r - 1} \dots s_l$$$).

Your goal is to maximize the length of the maximum substring of $$$s$$$ consisting of distinct (i.e. unique) characters.

The string consists of distinct characters if no character in this string appears more than once. For example, strings "abcde", "arctg" and "minecraft" consist of distinct characters but strings "codeforces", "abacaba" do not consist of distinct characters.

Input

The only line of the input contains one string $$$s$$$ consisting of no more than $$$10^6$$$ characters 'a', 'b', ..., 't' (first $$$20$$$ lowercase Latin letters).

Output

Print one integer — the maximum possible length of the maximum substring of $$$s$$$ consisting of distinct characters after reversing no more than one its substring.

Examples

Input

abacaba

Output

3

Input

abcdecdf

Output

6

Input

aabbcc

Output

3

Input

abcdeefc

Output

6

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

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