public class TRAI_25_X1_skeleton implements TRAI_25_X1 {
    // ^^ replace with your own userid here  ^^

    /**
     * SELF-EVALUATION HERE:
     * 
     *
     *
     */
    /**
     * Second-smallest element of an array.
     *
     * The input array contains only valid integers (i.e., no null values).
     *
     * @param A Input array
     * @return the second-smallest element, or null if the array is empty or contains only one element.
     */
    @Override
    public Integer secondSmallest(Integer[] A) {

        // Plan your solution first, then implement it.
        // See exercises 3-4 for an example of approach.

        return 0; // TODO
    }

}