import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.util.Arrays.*;

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 min_value = Math.abs(a[0]-a[1]);
        for (int i = 1 ; i < n ; i ++)
            {
            if (Math.abs(a[i]-a[i-1]) == 0)
                {
                min_value = 0;
                break;
            }
            else if (Math.abs(a[i]-a[i-1]) < min_value)
                min_value = Math.abs(a[i]-a[i-1]); 
        }
    System.out.println(min_value);
    }
}