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];
        
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }

        // your code goes here
        int value = Integer.MAX_VALUE;
        Arrays.sort(a);
         
         for(int i = 0; i < n - 1; i++){
           if(Math.abs((a[i] - a[i + 1])) < value)
              value = Math.abs((a[i] - a[i + 1]));
        }
        
        System.out.println(value);                           
    }
}