#include <bits/stdc++.h>
using namespace std;
const int MAXN=1e6+5,MAXB=2e7;
#define ll long long
int d1,d2,ans;
int getday(int y,int m) {
	if(m==1||m==3||m==5||m==7||m==8||m==10||m==12)
		return 31;
	if(m==4||m==6||m==9||m==11)
		return 30;
	if(y%4==0&&y%100!=0||y%400==0)
		return 29;
	else
		return 28;
}
int nextday(int x) {
	int y=x/10000;
	int m=x/100%100;
	int d=x%100;
	if(d==getday(y,m))
		d+=1;
	else if(m!=12) {
		m+=1;
		d=1;
	} else {
		y+=1;
		m=1;
		d=1;
	}
	return 10000*y+100*m+d;
}
int rev(int x) {
	int ans=0;
	while(x) {
		ans=ans*10+(x%10);
		x/=10;
	}
	return ans;
}
int main() {
	scanf("%d%d",&d1,&d2);
	for(int d=d1; d<=d2; d=nextday(d))
		if(d==rev(d))
			ans++;
	printf("%d",ans);
	return 0;
}