#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdio>
using namespace std;
int a[105],b[105],n1,n2,ans,n,m;
int s[15]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int run(int x)
{
	if(x%4==0&&x%100!=0||x%400==0)
	  return 1;
	return 0;
}
int main()
{
    cin>>n>>m;
	n1=n/10000;
	n2=m/10000;
	for(int i=n1;i<=n2;i++)
	{
		
		for(int j=1;j<=12;j++)
		{
			int t=0;
	     	if(run(i)==1)
		    {
			   t=1;
		    }  
			t+=s[j];
			for(int k=1;k<=t;k++)
			{
				int date=(k%10)*1000+(k/10)*100+(j%10)*10+j/10;
				int zui=i*10000+j*100+k;
			    if(zui>=n&&zui<=m)
			    {
			    	if(date==i)
			    	  ans++;
				}
			}
		}
	}
	cout<<ans;
	return 0;

}