using System;

public class Program

{

    public static string Caratteri(string c, int t)

    {

    string s = "";

    for (int i = 0; i < t; i++)

        {   

            s += c;

        }   

    return s;

    }

​

    public static void Diagonale(int lettera)

    {

    int k = 1, meno = lettera - 1;

    int number = 65;

    for (int i = 0; i < lettera; i++, number++)

        {

            var result = char.ConvertFromUtf32(number);

            string c;

            string d = "-";

            c = Convert.ToString(result);

            string a;

            string b;

            a = (Caratteri(c, k));

            b = (Caratteri(d, meno));

            Console.WriteLine(a + b);

            k++;

            meno--;

        }

    }

    public static int askInt(string question)

    {

        int number = 0;

        bool InputOk = false;

        while (!InputOk)

        {

            string answer;

            Console.WriteLine(question);

            answer = Console.ReadLine();

            InputOk = Int32.TryParse(answer, out number);

        }

    return number;

    }

    public static int askIntBetween(int min, int max, string question)

    {

        int n = 0;

        bool tuttoOk;

        tuttoOk = false;

    while (!tuttoOk)

        {

            n = askInt(question + " (tra " + min + " e " + max + ")");

            tuttoOk = (n >= min) && (n <= max);

        }

    return n;

    }

    public static void Main()

    {

        int square;

        square = askIntBetween(1, 26, "Dimmi un numero tra 1 e 26");

        Diagonale(square);

        }

    }