#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
int main()
{
string s;
while(cin >> s)
{
sort(s.begin(), s.end());
cout << s << endl;
}
return 0;
}
#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
int main()
{
string s;
while(cin >> s)
{
sort(s.begin(), s.end());
cout << s << endl;
}
return 0;
}