CF 1064C

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
int main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);cout.tie(0);

   string a;
   ll c;
   cin>>c>>a;
   sort(a.begin(),a.end());
   cout<<a<<endl;
   return 0;
}