ArrayList<String> Names;
void Main()
{
	Names = new ArrayList<String>();
	input_from_keyboard(input);
}

void input_from_keyboard(String input)
{
	if(!check_string_on_Names(input))
	{
		Names.add(input);
	}
}

void check_string_on_Names(String word)
{
	bool found = false;
	for(int i = 0; i < Names.length; i++)
	{
		if(Names[i] == word)
		{
			found = true;
			break;
		}
	}
	return found;
}