using System;

public class Program

{

    static void inputArr(out double[] arr)

    {

        Console.Write("Nhap so phan tu cua mang: ");

        int n = Int32.Parse(Console.ReadLine());

        arr = new double[n];

        for (int i = 0; i < arr.Length; i++)

        {

            Console.Write("Nhap phan tu {0} cua mang: ", i + 1);

            arr[i] = Int32.Parse(Console.ReadLine());

        }

    }

    static double findMaxValueInArray(double[] arr)

    {

        double Max = arr[0];

        for (int i = 1; i < arr.Length; i++)

        {

            Max = (arr[i] > Max) ? arr[i] : Max;

        }

        return Max;

    }

    static double findSecondMaxValueInArray(double[] arr)

    {

        double MaxValue = findMaxValueInArray(arr);

        double difference = arr[0] - arr[1];

        for (int i = 0; i < arr.Length; i++)

        {

            if (difference > (MaxValue - arr[i]) && MaxValue != arr[i])

            {

                difference = MaxValue - arr[i];

            }

        }

        return difference;

    }

    public static void Main()

    {

        double[] arr;

        inputArr(out arr);

        Console.WriteLine(findSecondMaxValueInArray(arr));          

    }

}