#include <bits/stdc++.h> using namespace std; #define all(v) v.begin(), v.end() #define yes cout << "Yes" << "\n" #define no cout << "No" << "\n" #define pb push_back #define F first #define S second typedef long long ll; typedef long double ld; typedef unsigned long long ull; typedef pair <int, int> pii; typedef vector <pii> vii; typedef vector <ll> vi; typedef vector <vi> vvi; template<typename T> void read(vector<T>& v) { for (auto &x : v) cin >> x; } template<typename T> void print(const vector<T>& v) { for (auto &x : v) cout << x << ' '; cout << "\n"; } const ll MAX = 1e6 + 5; const ll MOD = 1e9 + 7; void solve() { ll l, r; cin >> l >> r; int say = 0; for (ll i = l; i <= r; i++) { ll d = i; string s = ""; while (d) { s += (d % 10) + '0'; d /= 10; } reverse(all(s)); bool ok = true; for (int j = 0; j < s.size(); j++) { for (int k = j + 1; k < s.size(); k++) { string s1 = s.substr(j, k - j + 1); string s2 = s1; reverse(all(s2)); if (s2 == s1) { ok = false; } } } if (ok) { say++; } } cout << say << "\n"; } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); int t = 1; //cin >> t; for (int i = 1; i <= t; i++) { solve(); } }