ABC007_D.cpp

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define all(v) begin(v), end(v)
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define reps(i, s, n) for(int i = (int)(s); i < (int)(n); i++)
#define min(...) min({__VA_ARGS__})
#define max(...) max({__VA_ARGS__})

const int inf = 1LL << 55;
const int mod = 1e9 + 7;

int solve(string s) {
  int len = s.size();

  int dp[20][2][2][2] = {};
  dp[0][0][0][0] = 1;
  rep(i, len) rep(j, 2) rep(k, 2) rep(l, 2) {
    int lim = j ? 9 : s[i]-'0';
    rep(d, lim+1) {
      dp[i+1][j||d <lim][k||d==4][l||d==9] += dp[i][j][k][l];
    }
  }

  int res = 0;
  rep(j, 2) rep(k, 2) rep(l, 2) {
    if(k || l) res += dp[len][j][k][l];
  }

  return res;
}

signed main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(12);

  int A, B;
  cin >> A >> B;
  string a = to_string(A-1);
  string b = to_string(B);
  cout << solve(b) - solve(a) << endl;

  return 0;
}