#include <bits/stdc++.h>
using namespace std;

int i, j, pz;
long long a, b, rs, pw[15][20], pw10[20], now;

int main() {
  ios_base::sync_with_stdio(0);

  cin >> a >> b;

  if(a > 9) return cout << "0\n", 0;

  for(i = 1; i < 15; ++i) pw[i][0] = 1, pw[i][1] = i;
  for(i = pw10[0] = 1; i < 20; ++i) pw10[i] = pw10[i - 1] * 10;

  for(i = 1; i < 15; ++i)
    for(j = 2; j < 20; ++j)
      pw[i][j] = pw[i][j - 1] * i;

  for(pz = 17; pz >= 0; --pz) {
    for(i = a; i < 10; ++i)
      if(now + pw10[pz] * i >= b) break;
      else rs += pw[10 - a][pz];

    --i;
    if(now + pw10[pz] * i < b) now += pw10[pz] * i;
  }

  cout << rs << '\n';

  return 0;
}