#include <iostream>
using namespace std;

int main() {
    long int num; 
    int indiv, ten, hundred, thousand, ten_thousand, place; 

    cin >> num;

    if (num > 99999) {
        cout << "5" << endl;
        return 1;
    }

    if (num >= 10000) {
        place = 5;
    } else if (num >= 1000) {
        place = 4;
    } else if (num >= 100) {
        place = 3;
    } else if (num >= 10) {
        place = 2;
    } else {
        place = 1;
    }

    cout << place << endl;

    return 0;
	}
/**************************************************************
	Problem: 1710
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/