#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define pii pair<ll, ll>
#define to second
#define cost first
typedef long long ll;
typedef long double ld;
using namespace std;
std::vector<int> num;
ll dp[20][12][12][2][2];
string str;
ll answer(int idx, int a, int b, bool noconst, bool start) {
if(idx == (int)str.size()) return 1;
if(dp[idx][a][b][noconst][start] != -1) return dp[idx][a][b][noconst][start];
ll ret = 0, limit;
if(noconst) limit = 9; else limit = str[idx]-48; //num[idx];
for(int i = 0; i <= limit; i++) {
if(i == a || i == b) continue;
if(i == 0 && start == 0) ret += answer(idx+1, 10, 10, 1, 0);
else ret += answer(idx+1, b, i, noconst || (i < limit), 1);
} return dp[idx][a][b][noconst][start] = ret;
}
ll solve(ll n) {
//if(n < 0) return 0;
//if(n < 10) return n+1;
str = to_string(n);
// num.clear();
// while(n) {
// num.pb(n%10);
// n /= 10;
//}
// reverse(num.begin(), num.end());
memset(dp, -1, sizeof dp);
return answer(0, 10, 10, 0, 0);
}
int main()
{
//freopen("in.txt", "r", stdin);
//freopen("out.txt", "w", stdout);
ll a, b;
cin >> a >> b;
ll ans = solve(b);
if(a > 0) ans -= solve(a-1);
cout << ans << endl;
return 0;
}
