import java.util.Scanner;

public class Main {
static int[] days = new int[] { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

static boolean check(int date) {
    int year = date / 10000;
    int month = date % 10000 / 100;
    int day = date % 100;
    if (month == 0 || month > 12)
        return false;
    if (day == 0 || month != 2 && day > days[month])
        return false;
    if (month == 2) {
        int leap = 0;
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
            leap = 1;
        if (day > 28 + leap)
            return false;
    }
    return true;
}

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int date1 = sc.nextInt();
    int date2 = sc.nextInt();
    int res = 0;
    for (int i = 1000; i < 10000; i++) {
        int date = i, x = i;
        for (int j = 1; j <= 4; j++) {
            date = date * 10 + x % 10;
            x /= 10;
        }
        if (date1 <= date && date <= date2 && check(date))
            res++;
    }
    System.out.println(res);
}

}