B - ATCoder

Score : $200$ points

Problem Statement

You are given a string $S$ consisting of uppercase English letters. Find the length of the longest ACGT string that is a substring (see Notes) of $S$.

Here, a ACGT string is a string that contains no characters other than A, C, G and T.

Notes

A substring of a string $T$ is a string obtained by removing zero or more characters from the beginning and the end of $T$.

For example, the substrings of ATCODER include TCO, AT, CODER, ATCODER and (the empty string), but not AC.

Constraints

• $S$ is a string of length between $1$ and $10$ (inclusive).
• Each character in $S$ is an uppercase English letter.

Input

Input is given from Standard Input in the following format:

$S$

Output

Print the length of the longest ACGT string that is a substring of $S$.

ATCODER

3

Among the ACGT strings that are substrings of ATCODER, the longest one is ATC.

HATAGAYA

5

Among the ACGT strings that are substrings of HATAGAYA, the longest one is ATAGA.

SHINJUKU

0

Among the ACGT strings that are substrings of SHINJUKU, the longest one is (the empty string).