/* Telebe of Adicto && Mamedov yani AzeTurk810 I see humans but no humanity */ #include <algorithm> #include <iostream> #include <string> //mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); using ll = long long; using namespace std; #define ln '\n' #define INFi 1e9 #define INFll 1e18 #define int ll int dp[20][11][11][2]; string s; int solve(int cur , int num1 , int num2 , char k) { if(dp[cur][num1][num2][k] != -1) return dp[cur][num1][num2][k]; if(s.size() == cur) return dp[cur][num1][num2][k] = 1; int res = 0; if(num2 == 0) { res += solve(cur + 1 , 0 , 0 , 0); } int pos = s[cur] - '0' + 1; if(k == 1) { for(int i = 1;i < pos;i++) { if(num1 != i && num2 != i) { res += solve(cur + 1 , num2 , i , 0); } } if(pos != num2 && pos != num1) res += solve(cur + 1 , num2 , pos , k); } else { for(int i = 1;i <= 10;i++) { if(num1 != i && num2 != i) { res += solve(cur +1 , num2 , i , 0); } } } return dp[cur][num1][num2][k] = res; } int solve(int n) { for(int i = 0;i < 20;i++) { for(int n1 = 0; n1 < 11;n1 ++) { for(int n2 = 0;n2 < 11;n2++) { dp[i][n1][n2][0] = dp[i][n1][n2][1] = -1; } } } s = to_string(n); return solve(0 , 0 , 0 , 1); } void solve() { ll a , b; cin >> a >> b; cout << solve(b) - solve(max(0LL , a - 1)) << ln; } // Attack on titan<3 signed main() { ios::sync_with_stdio(0); cin.tie(nullptr); int t = 1; // cin >> t; for(int cases = 0 ; cases < t;cases ++) { solve(); } } // Just Imaginary