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#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int podchet(int chislo) {
	int h = 1;
	while (chislo >= 10) {
		chislo /= 10;
		h += 1;
	}
	return h;
}

int main() {
	int h;
	cin >> h;
	cout << podchet(h);
}