#include<bits/stdc++.h>
using namespace std;
int month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int palindrome(int aa){
	int ss=0;
	while(aa){
		ss=ss*10+aa%10;
		aa/=10;
	}
	return ss;
}
bool isRn(int year){
	return (year%4==0&&year%100!=0)||year%400==0;
}
int main(){
	int a,b,ans=0;
	cin>>a>>b;
	for(int i=a;i<=b;++i){
		int x=i/10000,y=i/100%100,z=i%100;
		if(isRn(x)) month[2]=29;
		else month[2]=28;
		if(palindrome(i)==i){
			if(((y<=12)&&(y>0))&&((z<=month[y])&&(z>0)))
			ans++;
		}
	}
	cout<<ans;
	return 0;
}