#include <iostream>
using namespace std;

bool cmp(int f, int e) {
	int a = f / 1000;
	int b = e % 10;
	if (a != b) {
		return false;
	}
	f %= 1000;
	e /= 10;
	a = f / 100;
	b = e % 10;
	if (a != b) {
		return false;
	}
	f %= 100;
	e /= 10;
	a = f / 10;
	b = e % 10;
	if (a != b) {
		return false;
	}
	f %= 10;
	e /= 10;
	if (f != e) {
		return false;
	}
	return true;
}

int main() {
	int date1;
	int date2;
	cin >> date1 >> date2;
	int ans = 0;
	for (int date  = date1;date <= date2;) {
		int f = date / 10000;
		int e = date % 10000;
		if (cmp(f, e))	++ans;
		 
		int month = date/100%100;
		int day = date % 100;
		int year = date / 10000;
		++day;
		switch (month) {
			case 3:
			case 5:
			case 7:
			case 8:
			case 10:
			case 12:
			case 1:{
				if (day > 31) {
					day = 1;
					++month;
					if (month > 12) {
						month = 1;
						++year;
					}
				}
				break;
			}
			case 2:{ 
				if ((year % 100 == 0 && year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)) {
					if (day > 29) {
						++month;
						day = 1;
						break;
					}
				}
				if (day > 28) {
					++month;
					day = 1;
				}
				break;
			}
			case 4:
			case 6:
			case 9:
			case 11:{
				if (day > 30) {
					day = 1;
					++month;
				}
				break;
			}
		}

		date = year * 10000 + month * 100 + day;
		
	}
	cout << ans;
	return 0;
}