#include<bits/stdc++.h>

using namespace std;

int d1,d2,ans=0; 
int nb[4] = {0};

int cnm(int n){
	int a = n/1000 + n/100%10*10 + n/10%10*100 + n%10*1000;
		nb[0] = a/1000;
		nb[1] = a/100%10;
		nb[2] = a/10%10;
		nb[3] = a%10;
	return a;
}

int main(){
	cin>>d1>>d2;
	int y1=d1/10000;
	int y2=d2/10000;
	for(int i=y1;i<=y2;i++){
		int a = cnm(i);
		int fuck = i*10000+a;
		if(fuck >= d1 and fuck <= d2 and nb[0]*10 + nb[1] <=12){
			if(nb[1] == 1 or nb[1] == 3 or nb[1] == 5 or nb[1] == 7 or nb[1] == 8 or (nb[0] == 1 and nb[1] == 0) or (nb[0] == 1 and nb[1] == 2)){
			if(nb[2]*10+nb[3] <= 31){
				ans++;
			}
		}
		else if(nb[1] == 4 or nb[1] == 6 or nb[1] == 9 or (nb[0] == 1 and nb[1] == 1)){
			if(nb[2]*10+nb[3] <= 30){
				ans++;
			}
		}
		else if(nb[1] == 2){
			if((i%4 == 0 and i%100 != 0) or i%400==0){
				if(nb[2]*10+nb[3] <= 29){
				ans++;
				}
			}
			else{
				if(nb[2]*10+nb[3] <= 28){	
				ans++;
				}
			}
			
		}
		}
		
	}
	cout<<ans;
	return 0;
}

可能有点乱 大佬见谅