#include <bits/stdc++.h>
using namespace std;
const int N = 1e6 + 3;
const long long int M = 1000000007;
void solve() {
  string s;
  cin >> s;
  int n = s.length();
  for (int i = 0; i < n - 1; ++i) {
    s += '0';
  }
  long long int ans = 0;
  for (int i = 0; i < 2 * (n - 1) + 1; ++i) {
    ans += ans + s[i] - '0';
    ans %= M;
  }
  cout << ans;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  solve(), cout << "\n";
  return 0;
}
