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Minimum Characters required to make a String Palindromic

Problem Setter: glowing_glare Problem Tester: RAMBO_tejasv

Problem Description

Given a string A. The only operation allowed is to insert characters at the beginning of the string.
Find how many minimum characters are needed to be inserted to make the string a palindrome string.

Problem Constraints
1 <= |A| <= 106

Input Format
The only argument given is string A.

Output Format
Return the minimum characters that are needed to be inserted to make the string a palindrome string.

Example Input
Input 1:
`A = "ABC"`
Input 2:
`A = "AACECAAAA"`

Example Output
Output 1:
`2`
Output 2:
`2`

Example Explanation
Explanation 1:
```Insert 'B' at beginning, string becomes: "BABC".
Insert 'C' at beginning, string becomes: "CBABC".```
Explanation 2:
```Insert 'A' at beginning, string becomes: "AAACECAAAA".
Insert 'A' at beginning, string becomes: "AAAACECAAAA".```

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 question? Checkout Sample Codes for more details.
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