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static void MakeSubsets(char[] subset, int position = -1)
{
	/*if (position == subset.Length)
	{
		Console.WriteLine(new string(subset));
		return;
	}
	subset[position] = 'a';
	MakeSubsets(subset, position + 1);
	subset[position] = 'b';
	MakeSubsets(subset, position + 1);*/
	
	if(subset.Length == 0)
	{
		Console.WriteLine();
		return;
	}
	
	if(!(subset[0] >= 'a' && subset[0] <= 'z'))
	{
		for(int i = 0; i < subset.Length; ++i)
			subset[i] = 'a';
	}
	
	switch(subset.Length)
	{
		case 1:{ position = 0; }break;
		default:{ position = position == -1 ? subset.Length - 2 : position; }break;
	}
	
	Console.WriteLine(subset);
	
	//if(subset.Length <= 2)
	//{
	
	if(subset[subset.Length - 1] + 1 != 'd')
	{
		++subset[subset.Length - 1];
		MakeSubsets(subset,position);
	}
	else
	{
		switch(subset.Length)
		{
			case 1:
				{
					return;
				}break;
			default:
				{
					for(int i = position + 1; i < subset.Length; ++i)
					{
						subset[i] = 'a';
					}
					
					if(subset[position] + 1 != 'd')
					{
						++subset[position];
						MakeSubsets(subset,position);
						return;
					}
					
					bool bChange = false;
					
					while(true)
					{
						if(position < 0)
						{
							break;
						}
						if(subset[position] + 1 != 'd')
						{
							++subset[position];
							bChange = true;
							break;
						}
						subset[position] = 'a';
						--position;
					}
					
					if(bChange)
					{
						MakeSubsets(subset,-1);
						return;
					}
					else
						return;
					
				}break;
		}
	}
	//}
}
//писал не индус