#include <iostream>
#include<cstring>
#include<algorithm>
using namespace std;
char a[250];
int main()
{
while(cin>>a){
sort(a,a+strlen(a));
cout<<a<<endl;
}
return 0;
}
#include <iostream>
#include<cstring>
#include<algorithm>
using namespace std;
char a[250];
int main()
{
while(cin>>a){
sort(a,a+strlen(a));
cout<<a<<endl;
}
return 0;
}