#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint1000000007;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000000

int main(){
	
	int n;
	cin>>n;
	
	vector<int> a(n);
	rep(i,n)cin>>a[i];
	sort(a.begin(),a.end());
	a.erase(unique(a.begin(),a.end()),a.end());
	int ans = 10000000;
	rep(i,a.size()-1)ans = min(ans,a[i+1]-a[i]);
	if(a.size()==1)ans = 0;
	cout<<ans<<endl;
	
	return 0;
}