public static String funnyString(String s) {
    int n = s.length();

    // Since the differences are symmetric, you only need to iterate up to the midpoint of the string
    for (int i = 0; i < n / 2; i++) {
        // Calculate the differences for the forward and backward traversals
        int leftDiff = Math.abs(s.charAt(i) - s.charAt(i + 1));
        int rightDiff = Math.abs(s.charAt(n - i - 1) - s.charAt(n - i - 2));

        if (leftDiff != rightDiff) {
            return "Not Funny";
        }                
    }        

    return "Funny";
}