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 answer = 2000000009;
        for(int i = 0; i < n-1; i++){
            if(a[i+1]-a[i]<answer){
                answer = a[i+1]-a[i];
            }
        }
        System.out.println(answer);
        // your code goes here
    }
}