task 3

using System;

public class Program
{
    public static void Main()
    {
        int n;
        string [] numbers;
        bool isinteger = true;
        int minimal = int.MaxValue;
        int maximal = int.MinValue;
        Console.WriteLine("Please enter a series of numbers separated with \",\":");
        numbers = Console.ReadLine().Split(',');
        int[] intnumbers = new int [numbers.Length];
        for (int i = 0; i < (numbers.Length); i++)
        {
            isinteger = int.TryParse(numbers[i], out intnumbers[i]);
            if (isinteger==false)
            {
                break;
            }
        }
        if (isinteger)
        {
            for (int i = 0 ; i< numbers.Length; i++)
            {
                if (intnumbers[i] < minimal)
                {
                    minimal = intnumbers[i];
                }
                if (intnumbers[i] > maximal)
                {
                    maximal = intnumbers[i];
                }

            }
            Console.WriteLine("minimal ={0}" , minimal);
                Console.WriteLine("maximal ={0}" , maximal);
        }
            else
            {
                Console.WriteLine("Not a Valid Entry!");
            }


    }
}