/* 
 * Problem  : 	LUCKY
 * Contest  : 	UOI-2006 (Dnepropetrovsk)
 * Type     : 	Test Generation
 * Date     : 	April 1, 2006
 * Author   : 	Shamil Yagiyayev
 * Language :	C#
 * Compiler :	.NET 1.1
 * Algorithm:	Random generation
 */

/* 

Usage:

substr-gen.exe 1 100 substr.5.dat
substr-gen.exe 1 500 substr.6.dat
substr-gen.exe 1 1000 substr.7.dat
substr-gen.exe 1 10000 substr.8.dat
substr-gen.exe 1 50000 substr.9.dat
substr-gen.exe 1 100000 substr.10.dat
substr-gen.exe 1 200000 substr.11.dat
substr-gen.exe 1 300000 substr.12.dat
substr-gen.exe 1 400000 substr.13.dat
substr-gen.exe 1 500000 substr.14.dat
substr-gen.exe 1 600000 substr.15.dat
substr-gen.exe 1 700000 substr.16.dat
substr-gen.exe 1 800000 substr.17.dat
substr-gen.exe 1 1000000 substr.18.dat
substr-gen.exe 1 5000000 substr.19.dat
substr-gen.exe 1 10000000 substr.20.dat

*/


using System;
using System.IO;
using System.Text;

class GenSubstrRandom
{
	static Random rand = new Random();

	static string GenString(int size)
	{
		StringBuilder sb = new StringBuilder();
		for (int i=0;i<size;i++)
		{
			char c = (char) ( 'a' + rand.Next(0, 25));
			sb.Append(c);
		}

		return sb.ToString();
	}

	// Number of tests
	// Size
	// FileMask
	static void Main(string[] args)
	{
		if (args.Length != 3)
		{
			Console.WriteLine("gen.exe <number of tests> <size> <file mask>");
			Console.WriteLine("For example: gen.exe 10 500 substr.{0}.dat");
			return;
		}

		int n = int.Parse(args[0]);
		int size = int.Parse(args[1]);
		string mask = args[2];

		for (int test=1; test<=n; test++)
		{
			int x = size;
			StreamWriter sw = File.CreateText(String.Format(mask, test));
			while (x > 0)
			{
				string str;
				if (x>50) {str = GenString(50); x-=50;} else {str = GenString(x); x=0;}
				sw.WriteLine("{0}", str);
			}
			sw.Close();
		}
	}
}