#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a[100], ans = 114514810;
  cin >> n;
  for (int i = 0; i < n; i++) cin >> a[i];
  sort(a, a + n);
  for (int i = 0; i < n - 1; i++) {
    ans = min(a[i + 1] - a[i], ans);
  }
  cout << ans << endl;
}
