#include <iostream>

using namespace std;

int days[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

bool 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 = year % 100 && year % 4 == 0 || year % 400 == 0;
        if (day > 28 + leap) return false;
    }

    return true;
}

int main()
{
    int date1, date2;
    cin >> date1 >> date2;

    int res = 0;
    for (int i = 1000; i < 10000; i ++)
    {
        int date = i, x = i;
        for (int j = 0; j < 4; j ++) date = date * 10 + x % 10, x /= 10;

        if (date1 <= date && date <= date2 && check(date)) res ++;
    }

    cout << res << endl;
}