#include <iostream>
using namespace std;
 
int main() {
	// Introduc variabilele a, b, c şi x;
	int a, b, c, x;
	// Citesc a, b, c, x;
	cin >> a >> b >> c >> x;
	// Introduc variabila “cnt” sa numar cifrele;
	int cnt = 0;
	// parcurg x;
	while (x > 0) {
			++cnt;
		x /= 10;
 
	}
		cout << cnt;
 
	// Daca “cnt” egal cu 1 si daca rest egal cu b;
	//Daca “cnt” egal cu a si rest egal cu c;
	//Afisez DA daca e diferit, afisez NU; 
	return 0;
}

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