#include <stdio.h>
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define ld long double
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pdd pair<ld, ld>
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second

ll p[30];

int main() {
  cin.sync_with_stdio(false);

  ll a, b;
  cin >> a >> b;

  if (a >= 10) {
    cout << "0\n";
    return 0;
  }

  b--;
  vector<ll> v;
  while (b) {
    v.pb(b % 10);
    b /= 10;
  }
  reverse(all(v));

  ll ans = 0;
  p[0] = 1;
  for (int i = 1; i < v.size(); i++) {
    p[i] = p[i - 1] * (9 - a + 1);
    ans += p[i];
  }

  int j = v.size() - 1;
  bool bad = 0;
  for (auto it : v) {
    if (a <= it) {
      ans += p[j] * (it - a);
    } else {
      bad = 1;
      break;
    }
    j--;
  }

  if (!bad) {
    ans++;
  }

  cout << ans << '\n';

  return 0;
}