text: #include <iostream>
  #include <string>
  #include <vector>
  #include <algorithm>
  #include <functional>
  #include <array>
  #include <iterator> 
  using namespace std;
  
  int main() {
  	string word;
  	getline(cin, word);
  	vector<int> ch;
  	for (char s : word)
  		ch.push_back(int(s));
  	sort(ch.begin(), ch.end());
  
  	for (int i : ch)
  		cout << char(i);
  
  }
  