func_code_string: #include <bits/stdc++.h>   using namespace std;   string str, queries[100010];   int n;   unsigned long long values[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};   unsigned long long length[10] = {10, 10, 10, 10, 10, 10, 10, 10, 10, 10};   int main() {     cin >> str >> n;     queries[0] =  0->  + str;     for (int i = 0; i < n; i++) {       cin >> queries[i + 1];     }     for (int i = n; i >= 0; i--) {       unsigned long long len = 1, val = 0;       for (int j = 3; j < queries[i].size(); ++j) {         int d = queries[i][j] -  0 ;         val = (val * length[d] + values[d]) % 1000000007;         len = len * length[d] % 1000000007;       }       length[queries[i][0] -  0 ] = len;       values[queries[i][0] -  0 ] = val;     }     cout << values[0] << endl;     return 0;   }   