#include <iostream>
using namespace std;
/*
Declaram si citim variabila “n”.
Cu ajutorul unei structuri repetitive “while” 
a cărei condiție de rulare este ca ultima cifra din “n” sa fie para:
eliminam cifra curenta.
 
3. Declaram variabila “count” cu rol de contor pe care o initializam cu “0”.
 
4. Cu ajutorul unei structuri repetitive “while” a cărei condiție de rulare este ca “n” sa fie mai mare decat “0”:
eliminam cifra curenta.
Incrementam variabila “count”.
    5. Afisam “count”.
*/
 
const int TEN = 10;
 
int main() {
	int n;
	cin >> n;
	while (n % TEN % 2 == 0) {
		n /= TEN;
	}
	int count = 0;
	while (n > 0) {
		++count;
		n /= TEN;
	}
	cout << count;
	return 0;
}

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