#include<bits/stdc++.h>
using namespace std;
using Int = long long;

template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int n;
  cin>>n;
  vector<Int> x(n);
  for(Int i=0;i<n;i++) cin>>x[i];
  sort(x.begin(),x.end());
  x.erase(unique(x.begin(),x.end()),x.end());
  n=x.size();
  if(n==1){
    cout<<0<<endl;
    return 0;
  }
  Int ans=x[1]-x[0];
  for(Int i=1;i<n;i++) chmin(ans,x[i]-x[i-1]);
  cout<<ans<<endl;
  return 0;
}