public int removeDuplicates(String s) {

    int left = 0, right = s.length() - 1;

    int minLength = Integer.MAX_VALUE;

    while (left < right) {

        if (s.charAt(left) != s.charAt(right)) {

            minLength = Math.min(minLength, right - left + 1);

            left++;

            right--;

        } else {

            left++;

        }

    }

    return minLength;

}