public class testing {

	public static void main(String[] args) {

		String unsorted = "cab";
		char min = unsorted.charAt(0), max = min, middle = min, at;
		for (int i = 0; i < unsorted.length(); i++) {
			at = unsorted.charAt(i);
			if (at > max) {
				middle = max;
				max = at;
			}
			else if (at < min) {
				middle = min;
				min = at;
			}
			else middle = at;
		}
		System.out.println(""+min+middle+max);
	}
}