import java.util.*;

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