import java.util.Scanner;

public class Ketairekae {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		StringBuilder str = new StringBuilder(s.nextLine());
		s.close();
		for(int j = 0;j < str.length()-1;j++){
			for(int i = 9;i > Integer.parseInt(str.substring(j, j+1));i--){
				String I = Integer.toString(i);
				if(str.lastIndexOf(I) > j){
					int k = str.lastIndexOf(I);
					char keep = str.charAt(k);
					str.setCharAt(k, str.charAt(j));
					str.setCharAt(j, keep);
					break;
				}
			}
		}
		System.out.println(str);

	}

}