import java.io.*;

class Main{

static final PrintWriter out=new PrintWriter(System.out);

public static void main(String[] args) throws IOException{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String line="";
while((line=br.readLine())!=null&&!line.isEmpty()){
int n=Integer.parseInt(line);
char[] num=line.toCharArray();
boolean[] used=new boolean[10];
for(int i=0;i<num.length;i++){
used[(int)(num[i]-'0')]=true;
}
loop:
for(int i=9;i>=1;i--){
if(!used[i]) continue;
for(int j=0;j<num.length;j++){
if((int)(num[j]-'0')>=i) continue;
swap(j,rightNum(i,num),num);
break loop;
}
}
out.println(num);
out.flush();
}
}

private static void swap(int a,int b,char[] num){
char c=num[a];
num[a]=num[b];
num[b]=c;
}

private static int rightNum(int a,char[] num){
for(int i=num.length-1;i>=0;i--){
if((int)(num[i]-'0')==a) return i;
}
return -1;
}
}