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
       Arrays.sort(a);
        int mindiff = Math.abs(a[1] -a[0]);
        for(int j =2 ; j!=a.length ; j++){
            mindiff = Math.min(mindiff, (Math.abs(a[j] - a[j-1])));
        }
        System.out.println(mindiff);
    }
}