#include <bits/stdc++.h>

using namespace std;

bool isLeapYear(int year)
{
  return (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
}
int getDaysINMonth(int year ,int month)
{
  if(month == 2) {
    return isLeapYear(year)? 29 : 28;
  }
  if(month == 4 || month == 6 || month == 9 || month == 11)
  {
    return 30;
  }
  return 31;
}
void nextDay(int &year,int & month,int & day)
{
  day++;
  if(day>getDaysINMonth(year,month))
  {
    day = 1;
    month++;
    if(month>12)
    {
      month = 1;
      year++;
    }
  }
}
bool isPalindrome(int year,int month,int day)
{
    char date[9];
    sprintf(date,"%04d%02d%02d",year,month,day);
    string s(date);
    string reversed(s.rbegin(),s.rend());
    return s == reversed;
}
int main()
{
 int startDate, endDate;
    cin >> startDate >> endDate;

    // 提取起始日期的年、月、日
    int startYear = startDate / 10000;
    int startMonth = (startDate / 100) % 100;
    int startDay = startDate % 100;

    // 提取结束日期的年、月、日
    int endYear = endDate / 10000;
    int endMonth = (endDate / 100) % 100;
    int endDay = endDate % 100;

    int count = 0; // 回文日期计数器

    // 遍历日期范围
    while (true) {
        // 检查当前日期是否是回文日期
        if (isPalindrome(startYear, startMonth, startDay)) {
            count++;
        }

        // 如果当前日期等于结束日期，退出循环
        if (startYear == endYear && startMonth == endMonth && startDay == endDay) {
            break;
        }

        // 日期增加一天
        nextDay(startYear, startMonth, startDay);
    }

    cout << count << endl;
    return 0;
}