#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ar array
void solve() {
ll a,b;
cin >> a >> b;
ll ans = 0;
for (ll i = a; i <= b;i++) {
string s = to_string(i);
bool ok = 1;
for (int i = 0; i < s.size() && ok;i++) {
string cur,cur1;
for (int j = i;j < s.size() && ok;j++) {
cur += s[j];
cur1 = s[j] + cur1;
if (i!=j && cur == cur1) ok = 0;
}
}
ans += ok;
}
cout << ans;
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int t = 1;
// cin >> t;
while (t--) {
solve();
cout << "\n";
}
return 0;
}
