import java.util.Scanner;
public class Yuki39{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		StringBuilder sb = new StringBuilder();
		String s;
		int max=0,pos=0;
		s = sc.next();
		sb.append(s);
		int[] n = new int[10];
		for(int i = 0;i<s.length();i++){
			n[Character.getNumericValue(s.charAt(i))]++;
		}
		for(int i = 0;i<10;i++){
			if(n[i] > 0)max = i;
		}
		for(int i = 0;i<s.length();i++){
			if(Character.getNumericValue(s.charAt(i)) == max)pos = i;
		}
		sb.setCharAt(pos,s.charAt(0));
		sb.replace(0,1,Integer.toString(max));
		System.out.println(sb.toString());
	}
}