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Problem · String

Find Palindrome Sub-string

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Ray likes puzzles. One day, he challenged Ansh with a puzzle to find a string that is the same when read forwards and backwards.

Write an algorithm to find the sub-string from the given string that is the same when read forwards and backwards.

Input

The input consists of a string - inputStr, representing the given string for the puzzle.

Output

From the given string, print a sub-string which is the same when read forwards and backwards.

Note

If there are multiple sub-strings of equal length, choose the lexicographically smallest one.

If there are multiple sub-strings of different length, choose the one with maximum length.

If there is no sub-string that is the same when read forwards and backwards print "None".

Sub-string is only valid if its length is more than 1.

Strings only contain uppercase characters (A-Z).

Examples

01 · Example 1

inputStr = "YABCCBAZ"
return = "ABCCBA"

Given string is "YABCCBAZ", in this only sub-string which is same when read forward and backward is "ABCCBA".

02 · Example 2

inputStr = "ABC"
return = "None"

Given string is "ABC", and no sub-string is present which is same when read forward and backward. So, the output is "None".

Constraints

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