#11WA 求助大佬！

#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;
}