import java.io.*;
import java.util.*;



public class Main_yukicoder3015 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		int a = sc.nextInt();
		int b = sc.nextInt();

		long hash = 1;
		TreeSet<Pair> hs = new TreeSet<>();
		for (int i = 0; i < 1_000_000; i++) {
			Pair tmp = new Pair(hash, i);
			hs.add(tmp);

			Pair l = hs.lower(tmp);
			if (l != null && l.a == tmp.a) {
//				pr.printf("%d %d\n", a, b);
//				pr.println(l);
//				pr.println(tmp);

				StringBuilder ret1 = new StringBuilder();
				for (int j = 0; j <= i; j++) {
					ret1.append('a');
				}
				StringBuilder ret2 = new StringBuilder(ret1);
				ret1.setCharAt(i - l.b, 'b');
				ret2.setCharAt(i - tmp.b, 'b');

				pr.println(ret1);
				pr.println(ret2);
				break;
			}

			hash *= a;
			hash %= b;
		}

	}

	private static class Pair implements Comparable<Pair> {
		long a;
		int b;

		Pair(long a, int b) {
			this.a = a;
			this.b = b;
		}

		@Override
		public int compareTo(Pair o) {
			if (a == o.a) {
				return Integer.compare(b, o.b);
			}
			return Long.compare(a, o.a);
		}

		@Override
		public int hashCode() {
			return Long.hashCode(a);
		}

		@Override
		public boolean equals(Object obj) {
			return a == ((Pair)obj).a && b == ((Pair)obj).b;
//			return a == ((Pair)obj).a;
		}

		@Override
		public String toString() {
			StringBuilder ret = new StringBuilder();

			ret.append(a);
			ret.append(',');
			ret.append(b);

			return ret.toString();
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);

		solve();

		pr.close();
		sc.close();
	}

	private static class Printer extends PrintWriter {
		Printer(PrintStream out) {
			super(out);
		}
	}
}