import java.util.*;
 

public class Main {
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n= sc.nextInt();
		String num = n+"";
		int max = num.charAt(0);
		int basyo=0;
		for(int i=1;i<num.length();i++){
			if(max<=(int)num.charAt(i)){
				basyo=i;
				max=(int)num.charAt(i);
			}
		}
		char[] sss = num.toCharArray();
		char temp = sss[0];
		sss[0]=sss[basyo];
		sss[basyo]=temp;
		String ans="";
		for(int i=0;i<num.length();i++){
			ans+=sss[i];
		}
		System.out.println(ans);
	}
}