Problem
水题
这个题的简便之处在于输入模式的固定，固定的八位数，固定前四位年份依次是月份和天。
因为一年的年份不会变，所以一年最多有一个回文数，只需要枚举一次即可，依次枚举判断即可，要注意闰年的判断，闰年分为普通闰年和世纪闰年

普通闰年的条件是

if (year % 4 == 0 && year % 100 != 0) return true;

世纪闰年：

if (year % 400 != 0) return true;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

class Main {
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static PrintWriter pw = new PrintWriter(System.out);

    public static void main(String[] args) throws IOException {

        String date1 = br.readLine();
        String date2 = br.readLine();
        int year1 = stringToInt_4(date1);
        int year2 = stringToInt_4(date2);
        int res = 0;
        for (int i = year1; i <= year2; i++) {
            if (check(i)) res++;
        }
        pw.print(res);
        pw.flush();
        pw.close();
        br.close();
    }

    public static int stringToInt_4(String s) {
        return Integer.parseInt(String.valueOf(s.charAt(0))) * 1000 + Integer.parseInt(String.valueOf(s.charAt(1))) * 100
                + Integer.parseInt(String.valueOf(s.charAt(2))) * 10 + Integer.parseInt(String.valueOf(s.charAt(3)));
    }

    public static int reverse(int u) {
        int res = 0;
        int i = 3;
        while (u != 0) {
            int temp = u % 10;
            u /= 10;
            res += temp * Math.pow(10, i--);
        }
        return res;
    }

    public static boolean check(int year) {
        int u = reverse(year);
        int month = u / 100;
        int day = u % 100;
        if (month == 2) {
            if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
                if (day >= 1 && day <= 29)
                    return true;
            } else {
                if (day >= 1 && day <= 28)
                    return true;
            }
        } else if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) {
            if (day >= 1 && day <= 31)
                return true;
        } else if (month == 4 || month == 6 || month == 9 || month == 11) {
            if (day >= 1 && day <= 30)
                return true;
        }
        return false;
    }
}