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();
        }
        int min = a[0] - a[1],c;
        for(int i = 0; i < n -1; i++){
            
            for(int j = i + 1; j < n; j ++){
                
               
                c = (int)Math.abs(a[i] - a[j]);
                if(c < min)
                    min = c;
               
            }
        }
        System.out.println(min);
        
    }
}