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