#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

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

  int n;
  cin >> n;
  vector<int> x(n);
  REP (i, n) cin >> x[i];

  sort(x.begin(), x.end());
  x.erase(unique(x.begin(), x.end()), x.end());

  if (x.size() == 1)
    cout << 0 << endl;
  else {
    int ret = x[1] - x[0];
    REP (i, n-1)
      ret = min(ret, x[i+1] - x[i]);
    cout << ret << endl;
  }
  
  return 0;
}