using System;

public class Program {
	public static void Main(string[] args) {
		Console.ReadLine(); // n
		string[] s = Console.ReadLine().Split(' ');
		
		int[] x = new int[s.Length];
		for (int i = 0; i < x.Length; i++) {
			x[i] = int.Parse(s[i]);
		}
		Array.Sort(x);
		
		int min = 0;
		for (int i = 1; i < x.Length; i++) {
			int dist = Math.Abs(x[i] - x[i-1]);
			if (dist < min && dist != 0 || min == 0) {
				min = dist;
			}
		}
		Console.WriteLine(min);
	}
}