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#include <bits/stdc++.h>
using namespace std;
const int N = 110;
char a[N];
int main() {
int n;
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
sort(a + 1, a + 1 + n);
for (int i = 1; i <= n; i++) cout << a[i];
return 0;
}