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

public class Main {

    private static int[][] dp;

    public static void main(String[] args) throws IOException {
        Scanner br = new Scanner(System.in);
        while (br.hasNext()) {
            int l = Integer.parseInt(br.next());
            int r = Integer.parseInt(br.next());
            dp = new int[15][10];
            for (int i = 0; i < 10; i++) {
                dp[1][i] = 1;
            }
            for (int i = 2; i < 15; i++) {
                for (int j = 0; j < 10; j++) {
                    for (int k = j; k <= 9; k++) {
                        dp[i][j] += dp[i - 1][k];
                    }
                }
            }
            System.out.println(count(r) - count(l - 1));
        }
    }

    private static int count(int x) {
        if (x == 0)
            return 1;
        List<Integer> list = new ArrayList<>();
        while (x > 0) {
            list.add(x % 10);
            x /= 10;
        }
        int ans = 0;
        int last = 0;
        for (int i = list.size() - 1; i >= 0; i--) {
            int t = list.get(i);
            for (int j = last; j < t; j++) {
                ans += dp[i + 1][j];
            }
            if (t < last)
                break;
            last = t;
            if (i == 0)
                ans++;
        }
        return ans;
    }
}