#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);
  if (n == 2) {
    cout << 0;
    return 0;
  }
  int ans = min(abs(arr[1] - arr[n - 1]), abs(arr[0] - arr[n - 2]));
  cout << ans;
  return 0;
}
