---

#include <iostream>

#include <cctype>

#include <algorithm>

 

using namespace std;

 

bool CompareMy(char a, char b){

if(!isdigit(a)&&isdigit(b)){

return true;

}

return false;

};

 

int main() {

string str;

getline(cin, str);

 

stable_sort(str.begin(),str.end(), CompareMy);

cout<<str<<endl;

return 0;

}