#include<bits/stdc++.h>
using namespace std;
int l,r,ans=0;
inline bool hwspd(int x){
	string a=to_string(x),b=a;
	reverse(b.begin(),b.end());
	return a==b;
}
inline bool f(int x){
	if(x%10000/100==2)
		return ((!(x/10000%4)&&x/10000%100)||!(x/10000%400))&&x%100==29;
	else if(x%10000/100>12||!(x%100))
		return 0;
	else
		switch(x%10000/100){
			case 1:
				return x%100<=31;
				break;
			case 3:
				return x%100<=31;
				break;
			case 4:
				return x%100<=30;
				break;
			case 5:
				return x%100<=31;
				break;
			case 6:
				return x%100<=30;
				break;
			case 7:
				return x%100<=31;
				break;
			case 8:
				return x%100<=31;
				break;
			case 9:
				return x%100<=30;
				break;
			case 10:
				return x%100<=31;
				break;
			case 11:
				return x%100<=30;
				break;
			case 12:
				return x%100<=31;
				break;
			default:
				return 0;
				break;
		}
}
int main(){
	cin>>l>>r;
	for(int i=l;i<=r;i++)
		if(f(i)&&hwspd(i))
			ans++;
	cout<<ans<<endl;
	return 0;
}