#include<iostream>
using namespace std;
int P(int n)
{
	int n1,m1;
	n1=n/10000;
	n-=n1*10000;
	m1=n/1000+n%1000/100*10+n%100/10*100+n%10*1000;
	if(n1==m1) return 1;
	else return 0;
}
int main()
{
	int n,m;
	cin>>n>>m;
	int ans=0;
	for(int i=n;i<=m;i++)
	{
		if(P(i)==1) ans++;
	}
	cout<<ans;
}