#include <bits/stdc++.h>
bool runnian(int date){
	int year = date/10000;
	if((year%4==0&&year%100!=0)||(year%400==0)){
		return true;	
	}else return false;
} 
bool huiwenshu(int date){
	int temp = date,ans=0;
	while(temp>0){
		ans = ans*10+temp%10;
		temp/=10;
	}
	if(ans==date) return true;
	else return false;
}
bool riqi(int date){
	int year = date/10000;
	int month = (date/100)%100;
	int day = date%100;
	bool b_month = false;
	bool b_day = false;
	if(month>=1&&month<=12) b_month = true;
	switch(month){
		case 1:
		case 3:
		case 5:
		case 7:
		case 8:
		case 10:
		case 12:{
			if(day==31) b_day = true;
			break;
		}
		case 4:
		case 6:
		case 9:
		case 11:{
			if(day==30) b_day = true;
			break;
		} 
		case 2:{
			if(runnian(year)){
				if(day==29) b_day = true;

			}else{
				if(day==28) b_day = true;
			}
			break;
		}
	}
	if(b_month&&b_day) return true;
	else return false;
}
using namespace std;
int main()
{
	int date1,date2,sum=0;
	cin>>date1>>date2;
	for(int i=date1;i<=date2;i++){
		if(riqi(i)&&huiwenshu(i)) sum++;
	}
	cout<<sum<<endl;
	return 0;
}