#include <bits/stdc++.h>
using namespace std;
string num;
int dp[19][11][11][2][2];
int mod = 1e9 + 7;
int rec(int pos, int p1, int p2, int f, int ok) {
if(pos == num.size()) return 1;
if(dp[pos][p1][p2][f][ok] != -1) return dp[pos][p1][p2][f][ok];
int LIM = 9;
if(!f) LIM = num[pos] - '0';
int res = 0;
for (int i = 0; i<=LIM; i++) {
if(ok) {
if(i == p1 || i == p2) continue;
res += rec(pos+1, i, p1, (f || i < LIM), 1);
}
else res += rec(pos+1, (i == 0 ? 10 : i), p1, (f || i < LIM), (i != 0));
}
return dp[pos][p1][p2][f][ok] = res;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
long long A, B;
cin >> A >> B;
num = to_string(B);
if(A == 0) {
memset(dp, -1 ,sizeof(dp));
cout << rec(0, 10, 10, 0,0) << '\n';
}
else {
A--;
memset(dp, -1 ,sizeof(dp));
B = rec(0, 10, 10, 0,0);
memset(dp, -1, sizeof(dp)); num = to_string(A);
cout << B - rec(0, 10, 10, 0, 0) << '\n';
}
return 0;
}
