#include <bits/stdc++.h>
using namespace std;
#define INF 100000000

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n, d = INF;
  cin >> n;
  vector<int> x(n);
  for (auto& e : x) cin >> e;
  sort(x.begin(), x.end());
  for (int i = 0; i < n - 1; i++) {
    if (x[i] != x[i + 1]) {
      d = min(d, x[i + 1] - x[i]);
    }
  }
  cout << (d != INF ? d : 0) << endl;
  return 0;
}