public class SameEnds {

    public static void main (String args[]) {

        String test = "abXYab";
        int testLength = test.length();
        String longestSub = " ";

        for (int i = 0; i < (testLength / 2); i++) {
            if (test.substring(i).equals(test.substring(testLength - i)))
                longestSub = test.substring(i);
        }

        System.out.println(longestSub);

    }

}