#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
const ll inf = 1e16;
const ll md = 1000000007;

int main() {
  int n;
  cin>>n;
  set<int> xx;
  rep(i,n){
    int x;
    cin>>x;
    xx.insert(x);
  }
  if(xx.size()==1){
    puts("0");
    return 0;
  }
  int ans=1000005;
  int px=-1;
  for(int x:xx){
    if(px==-1){
      px=x;
      continue;
    }
    ans=min(ans,x-px);
    px=x;
  }
  cout<<ans<<endl;
  return 0;
}