#include <iostream>
#include <bits/stdc++.h>
using namespace std;
int n, m,ans;
string c;
int x[13][2]{ {0,0}, {31,31},{28,29},{31,31},{30,30},{31,31},{30,30},{31,31},{31,31},{30,30},{31,31},{30,30},{31,31} };
bool check_year(int x)
{
	return (x % 4 == 0 && x % 100 != 0 || x % 400 == 0);
}

bool check(int a)
{

	c.clear();
	while (a)
	{
		int t = a % 10;
		c += (t + '0');
		a /= 10;

	}
	for (int i = 0; i < c.size() / 2; i++)
	{
		if (c[i] != c[c.size() - 1 - i])
			return  false;
		
	}

	return true;
}


void sub(int a, int b)
{       
	if (a > b)
		sub(b, a);
	else
	{
		int year1 = a / 10000, year2 = b / 10000;
		int month1 = a / 100 % 100, month2 = b / 100 % 100;
		int day1 = a % 100, day2 = b % 100;





		while (year1<year2||month1<month2||day1<day2)
		{
			
				day1++;
				if (day1 == x[month1][check_year(year1)] + 1)
				{
					month1++;
					day1 = 1;
				}
			if (month1 == 13)
			{
				year1++;
				month1 = 1;
			}
				

				int newday = ((year1 * 100 + month1) * 100) + day1;
				if (check(newday))
					ans++;

		}




	}
	

	



}


int main()
{
	int a, b;
	cin >> a>>b;

	if (a == b&&check(a))
		ans++;
	sub(a, b);

	cout << ans;
		 

	






}