import java.util.Scanner;

public class BarcodeGenerator {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int num1 = Integer.parseInt(scanner.nextLine());
        int num2 = Integer.parseInt(scanner.nextLine());

        int f1 = num1 / 1000;
        int f2 = num1 / 100 % 10;
        int f3 = num1 / 10 % 10;
        int f4 = num1 % 10;

        int s1 = num2 / 1000;
        int s2 = num2 / 100 % 10;
        int s3 = num2 / 10 % 10;
        int s4 = num2 % 10;

        for (int i = 1; i <= 9; i++) {
            for (int j = 1; j <= 9; j++) {
                for (int k = 1; k <= 9; k++) {
                    for (int l = 1; l <= 9; l++) {
                        if ((i % 2 == 0 || i == 1) && i >= num1 && i <= num2) {
                            if ((j % 2 == 0 || j == 1) && j >= num1 && j <= num2) {
                                if ((k % 2 == 0 || k == 1) && k >= num1 && k <= num2) {
                                    if ((l % 2 == 0 || l == 1) && l >= num1 && l <= num2) {
                                        System.out.printf("%d%d%d%d", i, j, k, l);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}