func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, len;   char p[1000];   int done[1000];   long long ans = 0;   long long p2[1000];   int main() {     int i, j;     scanf( %s , p);     p2[0] = 1;     for (i = 1; i <= 200; ++i) p2[i] = (p2[i - 1] * 2) % 1000000007;     len = strlen(p);     for (i = 0; i < len; ++i) done[i] = p[len - i - 1] -  0 ;     for (i = 0; i < len; ++i) {       ans = (ans * 2) % 1000000007;       if (done[i] == 1) ans = (ans + p2[i] * p2[i]) % 1000000007;     }     cout << ans;     return 0;   }   