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 min = a[1] - a[0];
        for (int i=2; i!=a.length;i++){
           min = Math.min(min, a[i]-a[i-1]);
        }

        System.out.println(min);

    }
}