#include <bits/stdc++.h>
//using namespace std;
typedef unsigned long long ul;
typedef signed long long ll;

int main(void)
{
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  std::cout << std::fixed;
  ll n;
  std::cin >> n;
  ll x[n];
  for (ll i = 0; i < n; ++i) std::cin >> x[i];
  std::sort(x, x+n);
  ll ans = 0;
  for (ll i = 0; i < n-1; ++i) {
    if (x[i] != x[i+1]) {
      if (ans==0) ans = x[i+1]-x[i];
      else ans = std::min(ans, x[i+1]-x[i]);
    }
  }
  std::cout << ans << std::endl;
  return 0;
}