#include <bits/stdc++.h>   using namespace std;   const int N = 2e2;   int i, a[N], n;   int main() {     cin >> n;     for (i = 0; i < n; i++) cin >> a[i];     sort(a, a + n);     cout << a[n - 1] <<    ;     for (i = 1; i < n - 1; i++) cout << a[i] <<    ;     cout << a[0];     return 0;   }   