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 j = 9; j > 0; j--) {
		    boolean hasFinish = false;
    		int maxIdx = 0;
    		for (int i = 0; i < arr.length; i++) {
    		    if (j == arr[i] - '0') {
    		        maxIdx = i;
    		    }
    		}
    		if (maxIdx == 0) {
    		    continue;
    		}
    		for (int i = 0; i < maxIdx; i++) {
    		    if (arr[i] - '0' < j) {
    		        char tmp = arr[i];
    		        arr[i] = arr[maxIdx];
    		        arr[maxIdx] = tmp;
    		        hasFinish = true;
    		        break;
    		    }
    		}
    		if (hasFinish) {
    		    break;
    		}
		}
		System.out.println(arr);
   }
}