#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> v(n);
  for (int i = 0; i < n; ++i) {
    cin >> v[i];
  }
  sort(v.begin(), v.end());
  cout << min(v[n - 1] - v[1], v[n - 2] - v[0]);
}
