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

public class Solution {
    
   static int findMinDiff(int arr[], int n)
{
  
   Arrays.sort(arr);
 

   int diff = Integer.MAX_VALUE;
 
   for (int i=0; i<n-1; i++)
      if (arr[i+1] - arr[i] < diff)
          diff = arr[i+1] - arr[i];

   return diff;
}

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
     //   int[] diff = new int[n-1]; 
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();            
        }
        
        System.out.println(findMinDiff(a, a.length));
        
        
        // your code goes here
    }
}