func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long p = 1e9 + 7;   char s[500010];   long long ans, n, i, sum, fac[500010], a[500010], f[500010][2];   int main() {     scanf( %s , s + 1);     n = strlen(s + 1);     for (i = 1; i <= n / 2; i++) swap(s[i], s[n - i + 1]);     f[1][0] = 10;     f[1][1] = 1;     fac[0] = 1;     for (i = 1; i <= n; i++) fac[i] = fac[i - 1] * 10 % p, a[i] = s[i] -  0 ;     sum = a[1];     for (i = 2; i <= n; i++) {       ans = (ans + (f[i - 1][0] - fac[i - 1] + p + f[i - 1][1]) % p * a[i]) % p;       f[i][0] = (f[i - 1][0] * 10 + f[i - 1][1] * 10) % p;       f[i][1] = (f[i - 1][1] + fac[i - 1]) % p;       ans = (ans + sum * (n - i + 1)) % p;       sum = (sum + a[i] * fac[i - 1]) % p;     }     printf( %lld , ans);   }   