#include<iostream>
#include<stdio.h>

using namespace std;

long long d1,d2,ans=0;
int m1[15]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int m2[15]={0,31,29,31,30,31,30,31,31,30,31,30,31};

int main(){
	
	scanf("%ld %ld",&d1,&d2);
	int a=d1/10000,b=d2/10000;
	int ma=(a%10)*10+(a/10)%10;
	int mb=(b%10)*10+(b/10)%10;
	for(int i=a;i<=b;i++){
		if(i==1311||i==1320||i==1340||i==1360||i==1390) continue;
		int month=(i%10)*10+(i/10)%10;
		int day=((i/100)%10)*10+i/1000;
		if(month<1||month>12||day<1||day>31) continue;
		if(i==a&&month<ma) continue;
		if(i==b&&month>mb) continue;
		if((i%4==0&&i%100!=0)||(i%400==1)){
			if(day<=m2[month]) ans++;
		}else{
			if(day<=m1[month]) ans++;
		}
	}
	cout<<ans;
	
	return 0;
}