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[int.Parse(N)];
            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++)
            {
                if(kyori[i]==kyori[i+1])
                {
                    continue;
                }
                int temp = kyori[i] - kyori[i + 1];
                if(temp<0)
                {
                    temp = temp * -1;
                }
                if(min>temp)
                {
                    min = temp;
                }
            }
            Console.WriteLine(min);
            
        }
        
    }
}