using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string N = Console.ReadLine();
            string X = Console.ReadLine();
            string[] kyoristr = X.Split(' ');
            int[] kyori = new int[kyoristr.Length];
            int min = 1000000000;
            for (int i=0;i<kyori.Length;i++)
            {
                kyori[i] = int.Parse(kyoristr[i]);
            }
            for(int i=0;i<kyori.Length-1;i++)
            {
                int temp = 0;
                
                if(kyori[i]==kyori[i+1])
                {
                    continue;
                }
                for (int j = i + 1; j < kyori.Length; j++)
                {
                    temp = kyori[i] - kyori[i + 1];
                    if (temp < 0)
                    {
                        temp = temp * -1;
                    }
                    if (min > temp)
                    {
                        min = temp;
                    }
                }
            }
            Console.WriteLine(min);
        }
        
    }
}