using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EXAM_2_LAB_KIAN_LUETKE
{
    class Program
    {
        static void Main(string[] args)
        {

            //Parameters
            int k, n;
            string s;
            UserInput(out s, out k, out n);

            Console.WriteLine("****************RESULTS****************");

            /**Excersise Test Cases**/
            //Test Case One
            Console.WriteLine(PrintKandN(s, k, n));
            //Test Case Two
            Console.WriteLine(PrintPrefix(s, k));
            //Test Case Three
            Console.WriteLine(PrintKCharsNTimes(s, k, n));



            Console.ReadKey();
        }

        //Task One
        public static string PrintKandN(string s, int k, int n)
        {
            return s[k] + new String('+', k) + s[n];
        }
        //Task Two
        public static string PrintPrefix(string s, int k)
        {
            return s.Substring(0, k);
        }
        //Task Three
        public static string PrintKCharsNTimes(string s, int k, int n)
        {
            return string.Concat(Enumerable.Repeat(s.Substring(0, k), n));
        }

        public static void UserInput(out string s, out int k, out int n)
        {
            //Init parameters
            k = 0; n = 0;
            Console.WriteLine("Please input a String s, an Integer k and an Interger n. Confirm each with the Enter Key on your Keyboard\n");
            Console.Write("String s: ");
            s = Console.ReadLine();
            bool kIsInteger = false, nIsInteger = false;
            while (!kIsInteger)
            {
                Console.Write("Integer k: ");
                kIsInteger = int.TryParse(Console.ReadLine(),out k);
            }
            while (!nIsInteger)
            {
                Console.Write("Integer n: ");
                nIsInteger = int.TryParse(Console.ReadLine(),out n);
            }
        }
    }
}