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