#include <bits/stdc++.h>
#define REP(a,b,c) for(int a=(int)b; a<(int)c; a++)
#define rep(a,b) REP(a,0,b)
#define pb(a) push_back(a)
#define show(a) rep(iiixxxaaaa, a.size()) cout << a[i] << ", ";
typedef long long int llint;
using namespace std;

int main(){
  llint N;
  cin >> N;
  vector<llint> X(N);
  rep(i,N) cin >> X[i];

  llint dis = 0;
  sort(X.begin(), X.end());
  rep(i,N-1){
	if(X[i] == X[i+1]) continue;
	dis = (dis==0) ? X[i+1]-X[i] : min(dis,X[i+1]-X[i]);
  }
  cout << dis << endl;
  return 0;
}