using System;
using System.Linq;
using System.Text;
using System.Collections.Generic;
 
public class Test
{
	static readonly Char[] letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".ToCharArray();
 
	private static String appendChars(int n)
	{
	    int length = n + 1;
	    StringBuilder sBuilder = new StringBuilder("A", length);
 
	    for (int i = n; sBuilder.Length < length; i += n)
	    {
	        Char nextChar = letters[i % letters.Length];
	        sBuilder.Append(nextChar);
	    }
 
	    return sBuilder.ToString();
	}
 
	public static void Main()
	{
        	int n = 5;
		IEnumerable<String> allWords = Enumerable.Range(0, n).Select(i => appendChars(i));
		String result = string.Join(Environment.NewLine, allWords.ToArray());
		Console.Write(result);
	}
}

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