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();
        }
        Arrays.sort(a);
        int minDiff = a[1]-a[0];
        for (int a_i= 2 ; a_i != a.length ; a_i++) {
         minDiff = Math.min(minDiff, a[a_i]-a[a_i-1]);
         }
                             System.out.println(minDiff);
        // your code goes here
    }
}