#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll n,m,sum; 
int main()
{
	cin>>n>>m;
	for(int i=n;i<=m;i++){
		if(i%10000<=1231){
			ll h=0,q=0,p=0;
			q=i/10000;
			p=q;
			for(int j=1;j<=4;j++){
				h=h*10+q%10;
				q/=10;
			}
			if(h==i-p*10000)
				sum++;
		}
	}
	cout<<sum;
	return 0;
}