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

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            List<char> alphabet = new List<char>();
            int num = 0;

            for (int i = 97; i <= 122; i++)
                alphabet.Add(Convert.ToChar(i));

            Console.WriteLine("Enter number: ");
            try
            {
                num = Convert.ToInt32(Console.ReadLine());
            }
            catch
            {
                Console.WriteLine("Error: ");
            }
            foreach (char ww in alphabet)
            {
                for (int i = 0; i < num; i++)
                    Console.Write(ww);
                Console.WriteLine();
            }
        }
    }
}