#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>
//#include<bits/stdc++.h>


using namespace std;




int main() {
  
	int n;
	cin>>n;
	vector<int>p(n);
	for(int i=0;i<n;i++)
		cin>>p[i];
	sort(p.begin(),p.end());
	int y=100000000;
	for(int i=0;i<n-1;i++){
		if(p[i]==p[i+1])continue;
		y=min(y,abs(p[i]-p[i+1]));
	}
	if(y==100000000)y=0;
	cout<<y<<endl;
    
    return 0;
}