func_code_string: #include <bits/stdc++.h>   using namespace std;   long long s[10], m[10];   const long long md = 1e9 + 7;   string str;   int n;   vector<int> v[100010];   int main() {     for (int i = 0; i <= 9; i++) {       m[i] = 10;       s[i] = i;     }     cin >> str;     scanf( %d , &n);     for (int i = 1; i <= n; i++) {       string st;       cin >> st;       v[i].push_back(st[0] -  0 );       for (int j = 3; j < st.size(); j++) v[i].push_back(st[j] -  0 );     }     for (int i = n; i >= 1; i--) {       int cur = v[i][0];       long long mm = 1, ss = 0;       for (int j = 1; j < v[i].size(); j++) {         ss = (ss * m[v[i][j]]) % md;         mm = (mm * m[v[i][j]]) % md;         ss += s[v[i][j]];         if (ss >= md) ss -= md;       }       s[cur] = ss;       m[cur] = mm;     }     long long ans = 0;     for (int i = 0; i < str.size(); i++) {       ans = (ans * m[str[i] -  0 ]) % md;       ans += s[str[i] -  0 ];       if (ans >= md) ans -= md;     }     printf( %lld , ans);     return 0;   }   