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

public class Solution {
    static int abs_diff = Integer.MAX_VALUE;

    private static int checkMinAbsDiff(List<Integer> a) {
		// TODO Auto-generated method stub
		if(a.size() == 0)
			return 0;
		int new_diff;
		Collections.sort(a);
		
		for(int i = 0; i < a.size() - 1; i++){
			new_diff = Math.abs(a.get(i) - a.get(i + 1));
			
			if(new_diff < abs_diff)
				abs_diff = new_diff;
		}
		return abs_diff;
	}
    
    public static void main(String[] args) {
         Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        List<Integer> my_list = new ArrayList<Integer>();
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
            my_list.add(a[a_i]);
        }
        // your code goes here
        
        
        System.out.println(checkMinAbsDiff(my_list));
        in.close();
    }
}