#include<bits/stdc++.h>
using namespace std;
int n,m;
bool d(int x){
	int temp=x;
	int num=0;
	while(x){
		num = num*10+x%10;
		x=x/10;
	}
	if(temp==num) return true;
	else return false;
	
}
int n1,n2,n3,n4,n5,n6,n7,n8,nian,yue,ri,ans;
int main(){
	cin>>n>>m;
	for(int i=n;i<=m;i++){
		int a=i;
		n8=a%10;
		a/=10;
		n7=a%10;
		a/=10;
		n6=a%10;
		a/=10;
		n5=a%10;
		a/=10;
		n4=a%10;
		a/=10;
		n3=a%10;
		a/=10;
		n2=a%10;
		a/=10;
		n1=a%10;
		a/=10;
		nian=n1*1000+n2*100+n3*10+n4;
		yue=n5*10+n6;
		ri=n7*10+n8;
		if(ri>31 || yue>12){
			continue;
		}
		if(yue==4||yue==6||yue==9||yue==11){
			if(ri>=31) continue;
		}
		if((nian%4==0&&nian%100!=0)||nian%400==0){
			if(yue==2){
				if(ri>29){
					continue;
				}
			}
		}
		else{
			if(yue==2){
				if(ri>28) continue;
			}
		}
		if(d(i)){
			ans++;
		}
								
	}
	cout<<ans;
	return 0;
}

4个WA