import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		String s = sc.next();
		
		int[] ar = new int[s.length()];
		for (int i=0; i<s.length(); i++) {
			ar[i] = Integer.parseInt(s.substring(i,i+1));
		}
		
		int base = 0;
		int search = 0;
		for (int i=0; i<s.length()-1; i++) {
			base = Integer.parseInt(s.substring(i,i+1));
			int max = -1;
			int l = 0;
			int r = 0;
			for (int j=s.length()-1; j>=i+1; j--) {
				search = Integer.parseInt(s.substring(j,j+1));
				if (search > base) {
					max = Math.max(max,search);
					l = i;
					r = j;
				}
			}
			if (max > base) {swap(ar,l,r); break;}
		}
		
		for (int i=0; i<s.length(); i++) {
			System.out.print(ar[i]);
		}
		System.out.println();
	}
	
	static int[] swap (int[] ar, int a, int b) {
		int temp = ar[a];
		ar[a] = ar[b];
		ar[b] = temp;
		return ar;
	}
}