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