#include <bits/stdc++.h>

using namespace std;

template <typename T> T gcd(T x, T y) {
  if (y == 0)
    return x;
  return gcd(y, x % y);
}

template <typename T> T lcm(T x, T y) {
  if (x == 0 || y == 0)
    return 0;
  return x / gcd(x, y) * y;
}

int main() {
  string S = "1000000007";
  string N;
  cin >> N;
  int x = max(S.length(), N.length());
  int y = min(S.length(), N.length());
  cout << x - y << endl;
}