#include<bits/stdc++.h>
using namespace std;
bool pol(string s){
for(int i = 0; i < s.size(); i++){
if(s[i] != s[s.size() - i - 1])
return false;
}
return true;
}
bool ok(long long x){
string s = to_string(x);
int n = s.size();
for(int i = 0; i < n; i++){
string sn = "";
sn += s[i];
for(int j = i + 1; j < n; j++){
sn += s[j];
if(pol(sn) == true){
return false;
}
}
}
return true;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
long long a, b, ans = 0;
cin >> a >> b;
for(int i = a; i <= b; i++){
ans += ok(i);
}
cout << ans << endl;
}
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