#include <bits/stdc++.h> using namespace std; #define int long long long long cnt = 0; signed main(){ long long a, b; cin >> a >> b; int cnt = 0; for(int k = a; k <= b; k++){ string s = to_string(k); bool ok = true, yes = false; for(int i = 0; i < s.size() - 1; i++){ ok = true; for(int j = i + 1; j < s.size(); j++){ ok = true; for(int a = i; a <= j; a++){ if(s[a] != s[i + j - a]){ ok = false; break; } } if(ok){ yes = true; break; } //else cnt++; } if(yes) break; } if(!yes) cnt++; } cout << cnt << endl; }