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 res = a[0] - a[1];
        for(int i=0; i<n; i++){
            for(int j=i+1; j<n; j++){
                int diff  = posValue(a[i], a[j]);
                
                if(res > diff){
                    res = diff;
                }
            }
        }
        System.out.println(res);
    }
    public static int posValue(int a, int b){
        if((a-b) < 0)
            return -(a-b);
        else
            return (a-b);
    }
}