import java.util.Random;

public class SearchSample {
	public static void main(String[] args) {
		Random random = new Random();
		System.out.println("a");
		if (!random.nextBoolean()) {
			System.out.println("b");
			switch (random.nextInt(3))
			{
			case 0 :
				System.out.println("c");
				if (!random.nextBoolean()) {
					System.out.println("d");
				} else {
					System.out.println("dd");
					switch (random.nextInt(1))
					{
					case 0 :
						System.out.println("e");
						break;
					}
				}
				break;
			case 1 :
				System.out.println("cc");
				break;
			case 2 :
				System.out.println("ccc");
				break;
			}
		} else {
			System.out.println("bb");
			if (!random.nextBoolean()) {
				System.out.println("cccc");
			} else {
				System.out.println("ccccc");
			}
		}
	}
}