import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        String n=koko.next();
        int[] b = new int[n.length()];
        int[] c = new int[n.length()];
        for(int i=0; i<n.length(); i++){
            b[i]=Character.getNumericValue(n.charAt(i));
            c[i]=b[i];
        }
        Arrays.sort(c);
loop1:  for(int i=0; i<n.length(); i++){
            if(b[i]!=c[n.length()-1-i]){
                for(int j=n.length()-1; j>i; j--){
                    if(b[j]==c[n.length()-1-i]){
                        int d = b[i];
                        b[i]=b[j];
                        b[j]=d;
                        break loop1;
                    }
                }
            }
        }
        char[] ans= new char[n.length()];
        for(int i=0; i<n.length(); i++){
          ans[i]=String.valueOf(b[i]).charAt(0);
        }
        String an = String.valueOf(ans);
        System.out.println(an);
    }
}