class Program
{
    static void Main(string[] args)
    {
        string inputCount = Console.ReadLine()!;
        string[] inputNum = Console.ReadLine()!.Split(' ');
        List<int> numList = new List<int>();
        int ans = 0;
        int count = 0;

        if (inputCount == "1")
        {
            Console.WriteLine(0);
            return;
        }

        for (int i = 0; i < inputNum.Length; i++)
        {
            numList.Add(int.Parse(inputNum[i]));
        }

        numList.Sort();
        for (int i = 1; i < numList.Count; i++)
        {
            int firstPoint = numList[i - 1];
            int secondPoint = numList[i];

            if (secondPoint - firstPoint != 0)
            {
                if (count == 0)
                {
                    ans = secondPoint - firstPoint;
                    count++;
                }
                else if (ans > secondPoint - firstPoint && count == 1)
                {
                    ans = secondPoint - firstPoint;
                }
            }
        }

        if (ans <= -1)
        {
            ans *= -1;
        }

        Console.WriteLine(ans);
    }
}