import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int left = sc.nextInt();
		int right = sc.nextInt();
		int time = 0;
		int[] ints = new int[10];	//避免频繁创建数组
		for (int i = left; i <= right; i++) {
			if (isOk(ints, i)) {
				time++;
			}
		}
		System.out.println(time);
	}

	public static boolean isOk(int[] ints, int num) {
		int index = 0;
		while (num != 0) {
			ints[index++] = num % 10;
			num /= 10;
		}
		return isSumSame(0, 0, ints, 0, index);
	}

	private static boolean isSumSame(int sum1, int sum2, int[] ints, int i,
			int length) {
		if (i == length) {
			return sum1 == sum2;
		}
		return isSumSame(sum1, sum2 + ints[i], ints, i + 1, length)
				|| isSumSame(sum1 + ints[i], sum2, ints, i + 1, length);
	}
}