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###### Description

A palindrome is a sequence of characters which reads the same backwards and forwards. Given the string s, complete a solution function that returns the length of the longest palindrome within the substrings of `s`

.

For example, when string `s`

is "abcdcba", return 7.

##### Constraints

- Length of string
`s`

: a natural number less than or equal to 2,500 - The string
`s`

consists only of lowercase alphabetic characters

##### Example

s | answer |
---|---|

"abcdcba" | 7 |

"abacde" | 3 |

Example #1

Returns 7 because the whole string s is palindrome based on the fourth digit "d".

Example #2

Returns 3 because "aba" is the palindrome based on the second digit "b".

Result
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