## 07 May Markham Saturday 15:30 Python Homework 20.05.02.

**Problem Description**

A palindrome is a word which is the same when read forwards as it is when read backwards. For example, ** mom** and

**are two palindromes.**

*anna*A word which has just one letter, such as * a*, is also a palindrome.

Given a word, what is the longest palindrome that is contained in the word? That is, what is the longest palindrome that we can obtain, if we are allowed to delete characters from the beginning and/or the end of the string?

**Input Specification**

The input will consist of one line, containing a sequence of at least 1 and at most 40 lowercase letters.

**Output Specification**

Output the total number of letters of the longest palindrome contained in the input word.

**Sample Input 1**

banana

**Output for Sample Input 1**

5

**Explanation for Output for Sample Input 1**

The palindrome ** anana **has 5 letters.

**Sample Input 2**

abracadabra

**Output for Sample Input 2**

3

**Explanation for Output for Sample Input 2**

The palindromes ** aca **and

**have 3 letters, and there are no other palindromes in the input which are longer.**

*ada***Sample Input 3**

abba

**Output for Sample Input 3**

4

**Hint:**

Given a string example: letters = “necessary”, you can use slice of the list to get part of the string, for example:

letters[1:4] is **“ece”**

or

letters[3:0:-1] will read letters backwards, but you can also get **“ece”**

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