String Symmetry Checker

Given a string s, determine whether it is symmetric. A string is considered symmetric if its length is even and the first half of the string is the mirror image of the second half. If the string has less than 2 characters, the program should output None. If the string has an odd number of characters, output False.

For example, the string "abccba" is symmetric because splitting it into "abc" and "cba" produces two mirror images.

inputFormat

A single line that contains the string s.

outputFormat

Print True if the string is symmetric, False if it is not, or None if the string has fewer than 2 characters.## sample

abccba

True