include<stdio.h>

int main() {

int m,n,a[15],month[13]={0,31,29,31,30,31,30,31,31,30,31,30,31},x,sum=0,temp,flag=1,jugday,jugmon,count=0;
scanf("%d%d",&m,&n);
for(int i=m;i<=n;i++)
{
	x=i;
	sum=0;
	flag=8;
	while(x>0)
	{
		
		temp=x%10;
		a[flag]=temp;
		sum=sum*10+temp;
		x=x/10;
		flag--;
	}
	jugday=a[7]*10+a[8];
	jugmon=a[5]*10+a[6];
	if(jugday<=month[jugmon]&&jugmon<=12)
	{
		if(i==sum)
		{
			count++;
		}
		}	

} printf("%d",count);

return 0;

}