import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        List<Integer> set = new ArrayList<Integer>();
        
      //  int[] a = new int[n];
        for(int a_i=0; a_i < n; a_i++){
           set.add((in.nextInt()));
        }
        Collections.sort(set);
        
        int smallest=Integer.MAX_VALUE;
        Iterator iter=set.iterator();
        int a=(int)iter.next();
        while(iter.hasNext()){
                int b=(int)iter.next();
                int difference=Math.abs(a-b);
                if(smallest>difference){
                    smallest=difference;
                    if(smallest==0)
                        break;
                }
                a=b;
        }
        System.out.println(smallest);
    }
}