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;
                }

                temp = kyori[i] - kyori[i + 1];
                if (temp < 0)
                {
                    temp = temp * -1;
                }
                if (min > temp)
                {
                    min = temp;
                }

            }
            if (min == 1000000000)
            {
                Console.WriteLine("0");
            }
            else
            {
                Console.WriteLine(min);
            }
        }
        
    }
}