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[] nums = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            nums[a_i] = in.nextInt();
        }
        Arrays.sort(nums);
        int diff=1000000000;
        for(int i=0;i<nums.length-1;i++)
            {
            if(Math.abs(nums[i]-nums[i+1])<diff)
                diff=Math.abs(nums[i]-nums[i+1]);
        }
        
        System.out.println(diff);
        // your code goes here
    }
}