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 minDiff = a[0]-a[1];
        for (int a_i=0; a_i<n;a_i++){
            for (int b_i=a_i+1;b_i<n; b_i++) {
                
                    if ( java.lang.Math.abs(a[a_i] - a[b_i]) < minDiff ) {
                      minDiff = a[a_i] - a[b_i];
                    }                    
               
                
            }
        }
        
        System.out.println(minDiff);
    }
}