import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] arr = sc.next().toCharArray();
        for (int i = 0; i < arr.length - 1; i++) {
            int max = arr[i];
            int idx = i;
            for (int j = i + 1; j < arr.length; j++) {
                if (max <= arr[j]) {
                    idx = j;
                    max = arr[j];
                }
            }
            if (arr[i] < max) {
                char tmp = arr[idx];
                arr[idx] = arr[i];
                arr[i] = tmp;
                break;
            }
        }
        System.out.println(arr);
    }
}