Largest Palindromic Substring

Given a string, , find its largest palindromic substring.

Input Format

A string, .

Constraints

All the characters are lower-case English letters.

Output Format

Print the largest possible substring of .

Sample Input

hackerrekcahba

Sample Output

hackerrekcah

Explanation

The longest palindromic substring of the the given input hackerrekcahbahh is hackerrekcah.

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