#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n, d;
  cin >> n;
  vector<int> a(n);
  for (auto& e : a) cin >> e;
  sort(a.begin(), a.end());
  int min = 1000001;
  for (int i = 0; i < n - 1; i++) {
    if (a[i] == a[i + 1]) {
      continue;
    }
    d = a[i + 1] - a[i];
    if (d < min) min = d;
  }
  if (min == 1000001) min = 0;
  cout << min << endl;
}