#include <bits/stdc++.h>
using namespace std;

int main() {
  int64_t N;
  cin >> N;
  vector<int64_t> xs(N);
  for (int64_t i = 0; i < N; i++) {
    cin >> xs[i];
  }
  int64_t ans = 1LL << 48;
  sort(xs.begin(), xs.end());
  for (int64_t i = 0; i < N - 1; i++) {
    if (xs[i] != xs[i + 1]) {
      ans = min(ans, xs[i + 1] - xs[i]);
    }
  }
  if (ans == 1LL << 48) ans = 0;
  cout << ans << endl;
  return 0;
}