#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  int n;
  cin >> n;

  vector<int> v(n);
  rep(i, 0, n) cin >> v[i];
  sort(v.begin(), v.end());
  v.erase(unique(v.begin(), v.end()),v.end());

  if (v.size() == 1) {
    cout << 0 << endl;
    return 0;
  }

  int ans = 1e9;
  n = v.size();
  rep(i, 1, n) ans = min(ans, v[i] - v[i - 1]);

  cout << ans << endl;
}