#include<iostream>

using namespace std;

/*
1. 枚举回文数
2. 判断是否在范围内
3. 判断日期是否合法
*/
int days[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

bool check_vaild(int date)
{
    int year = date/10000;
    int month = date % 10000 / 100;
    int day = date % 100;

    if(month == 0 || month > 12)    return false;
    if(day == 0 || month != 2 && day > days[month]) return false;

    if(month == 2)
    {
        int leap = year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
        if(day > 28 + leap) return false;
    }
    return true;
}
int main()
{
    int date1,date2;
    cin>>date1>>date2;
    int ans=0;
    for(int i=1000;i<10000;i++)
    {
        int date = i,x=i;
        for(int j=0;j<4;j++)    date=date*10+x%10,x/=10;//翻转拼接

        if(date1<=date && date <= date2 && check_vaild(date))   ans++;

    }

    cout<<ans<<endl;
    return 0;

}