#include <bits/stdc++.h> using namespace std; #define endl '\n' #define int long long #define ll long long #define ull unsigned long long #define lb lower_bound #define ub upper_bound #define IOS ios::sync_with_stdio(false), cin.tie(0), cout.tie(0) int gcd(int a, int b){ return __gcd(a, b); } int lcm(int a, int b){ return a / gcd(a, b) * b; } int dx[] = {-1, 1, 0, 0}; int dy[] = {0, 0, -1, 1}; bool sth(string &s){ for (int i = 0; i < s.size(); i++){ for (int j = i + 1; j < s.size(); j++){ bool ok = true; int l = i, r = j; while(l < r){ if(s[l] != s[r]){ ok = false; break; } l++; r--; } if(ok)return false; } } return true; } void solve(){ int a, b; cin >> a >> b; int ans = 0; for (int i = a; i <= b; i++){ string s = to_string(i); if(sth(s)){ ans++; } } cout << ans << endl; } signed main(){ IOS; int t = 1; //cin >> t; while (t--){ solve(); } }