#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize("O3")
#define ll long long
#define fori(i,j,k) for(ll i=j; i<=k;i++)
#define study ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define pb push_back
#define all(s) s.begin(),s.end()
#define ins insert
#define ss second
#define ff first
ll sz=4e3+10;
ll INF=1e12;
ll mod=1e9+7;
void work(){
ll a,b;
cin>>a>>b;
ll cur=0;
fori(k,a,b){
string s=to_string(k);
bool ok=1;
fori(i,0,s.size()-2){
for(ll j=2;j+i<=s.size();j++){
string s1=s.substr(i,j);
//cout<<s1<<" ";
string s2=s1;
reverse(all(s1));
if(s1==s2){
ok=0;
break;
}
}
if(!ok)
break;
}
if(ok)
cur++;
}
cout<<cur<<endl;
}
int main()
{
study;
ll t=1;
//cin>>t;
fori(i,1,t)
work();
}
