//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

constexpr LL mod = 1e9 + 7;

LL dp[10100][2][110];

LL f(string &S, LL D, LL k = 0, bool tight = true, LL sum = 0) {

    if (k == S.size()) {
        return dp[k][tight][sum] = (sum == 0);
    }

    int x = S[k] - '0';

    int r = tight ? x : 9;

    LL &ret = dp[k][tight][sum];

    if (~ret)return ret;

    ret = 0;

    for (int i = 0; i <= r; i++) {
        ret += f(S, D, k + 1, tight && i == r, (sum + i) % D);
        ret %= mod;
    }

    return ret;
}

int main() {

    string K;
    LL D;
    cin >> K >> D;

    memset(dp, -1, sizeof(dp));
    f(K, D);

    cout << (dp[0][0][0] + dp[0][1][0] + mod) % mod;

    return 0;
}










































Measured memory_bytes: 18560