func_code_string: #include <bits/stdc++.h>   using namespace std;   char str[110];   long long ans = 0;   int main() {     cin >> str;     int ll = strlen(str);     long long k = 1, l = 1;     for (int i = 1; i < ll; i++) {       l = (l % 1000000007 * 2) % 1000000007;     }     k = l;     for (int i = ll - 1; i >= 0; i--) {       if (str[i] ==  1 ) ans = (ans % 1000000007 + k % 1000000007) % 1000000007;       k = (k % 1000000007 * 2) % 1000000007;     }     cout << ans;     return 0;   }   