Minimum Characters required to make a String Palindromic

You are given a string. The only operation allowed is to insert characters in the beginning of the string. How many minimum characters are needed to be inserted to make the string a palindrome string

Example:
Input: ABC
Output: 2
Input: AACECAAAA
Output: 2

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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