import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        P2010();
    }
public static void P2010(){
//        接受值
        Scanner sc = new Scanner(System.in);
        String start = sc.nextLine();
        String end = sc.nextLine();
//        分割出来年份
        String startYear = start.substring(0, 4);
        String endYear = end.substring(0, 4);
//        初始化计数
        int count = 0;
//        便利年份
        for (int i = Integer.parseInt(startYear); i < Integer.parseInt(endYear)+1; i++) {
//            将年份翻转后制造回文数
            StringBuilder reverse = new StringBuilder(i+"").reverse();
            String outStr=i+""+reverse;
//            如果开始的和结束的和生成的日期相等就返回1并结束程序
            if(outStr.equals(end)&&outStr.equals(start)) {
                System.out.println(1);
                return;
            }
//            分割生成的回文日期的日月
            int iMonth = Integer.parseInt(outStr.substring(4, 6));
            int iDay = Integer.parseInt(outStr.substring(6, 8));

//            如果生成的回文日期不符合标准则重新生成
//            判断月份是否合标准
            if (iMonth > 12 | iMonth==0) {
                continue;
            }
//            判断日期是否合标准
            switch (iMonth) {
                case 1: if(iDay >31) continue;
                case 3: if(iDay >30) continue;
                case 4: if(iDay >20) continue;
                case 5: if(iDay >31) continue;
                case 6: if(iDay >30) continue;
                case 7: if(iDay >31) continue;
                case 8: if(iDay >31) continue;
                case 9: if(iDay >30) continue;
                case 10: if(iDay >31) continue;
                case 11: if(iDay >30) continue;
                case 12: if(iDay >31) continue;
            }

//            判断是否符合闰年标准
            if(i%4==0&&i%100==0||i%400==0){
                if ((iMonth==2 && iDay < 28)) {
                    continue;
                }
            }

//            判断是否在日期范围内
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd");
            LocalDate startDate = LocalDate.parse(start, formatter);
            LocalDate endDate = LocalDate.parse(end, formatter);
            LocalDate iDate = LocalDate.parse(outStr, formatter);
            if(!(startDate.isBefore(iDate)&&endDate.isAfter(iDate))) {
                continue;
            }
//            通过校验则累加count
            count++;
        }
        System.out.println(count);
    }
}