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();
        int[] a = new int[n];
        int d,min_diff;
        min_diff= a[0]-a[1];
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        
        for(int i=0;i<n;i++)
         {
            for(int j=i+1;j<n;j++)
              {
       //         if(a[i] > a[j])
         //         {  
                    d=Math.abs(a[i]-a[j]);
                System.out.println("d is " + d + " min_diff is  " + min_diff);
      //            }
      //          else
      //            {
      //               d= a[j] - a[i];  
      //            }  
                if(d< min_diff)
                  {
                     min_diff= d;  
                  }
                  
              }
         }
        System.out.println(min_diff);
        // your code goes here
    }
}