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 sc = new Scanner(System.in);
        //System.out.println("Enter n!");
        int n = sc.nextInt();
        int [] a = new int[n];
        int [] b = new int[n];
        for(int i=0; i < n; i++){
            a[i] = sc.nextInt();
        }
        
        int diff=Math.abs(a[0]-a[1]);
        Arrays.sort(a);
        //System.out.println("First difference is "+diff);
        for(int i=0;i<n;i++)
        {
        	for(int j=i+1;j<n;j++)
        	{
        		int d1=Math.abs(a[i]-a[j]);
        		if(d1<diff)
        		{
        			diff=d1;
        		}
        		else
        		{
        			break;
        		}
        	}
        }
        System.out.println(diff);
        // your code goes here
    }
}