#include <bits/stdc++.h>
using namespace std;
void magic() {
  int n;
  cin >> n;
  int arr[n];
  for (int i = 0; i < n; ++i) {
    cin >> arr[i];
  }
  sort(arr, arr + n);
  cout << min(arr[n - 1] - arr[1], arr[n - 2] - arr[0]) << endl;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  magic();
}
