#include <iostream>


using namespace std;

unsigned int cmmnr(unsigned int);

int main()
{
    unsigned int n;
    cin>>n;
    cout<<cmmnr(n);
    return 0;
}
#include <stdlib.h>
#include <string.h>
unsigned int cmmnr(unsigned int n){
    int i,j,nr=0;
    char sir[11],aux[1];
    itoa(n,sir,10);
    nr=strlen(sir);
    for(i=0;i<nr;i++){
        for(j=i;j<nr;j++){
            if(sir[i]<sir[j]){
                aux[1]=sir[i];
                sir[i]=sir[j];
                sir[j]=aux[1];
            }
        }
    }
    n=atoi(sir);
    return n;
}