func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long int n, k;     scanf( %lld , &n);     scanf( %lld , &k);     long long int i, j;     long long int val = 0, val1 = 0, val2 = 1;     for (i = 1; i < k; i++) {       val = (val * 10) + 9;       val2 = val2 * 10;     }     val1 = (val * 10) + 9;     long long int arr[n + 5];     long long int brr[n + 5];     long long int m = n / k;     for (i = 0; i < m; i++) {       scanf( %lld , &arr[i]);     }     for (i = 0; i < m; i++) {       scanf( %lld , &brr[i]);     }     long long int tot = 1;     long long int mod = 1e9 + 7;     for (i = 0; i < m; i++) {       long long int t1 = val1 / arr[i];       if (brr[i] != 0) t1++;       long long int t2 = (brr[i] * val2) + val;       long long int t3 = t2 / arr[i];       long long int t4 = (max(0LL, brr[i] * val2 - 1)) / arr[i];       t3 = t3 - t4;       long long int t5 = t1 - t3;       tot *= t5;       tot %= mod;     }     cout << tot <<   n ;   }   