#include<iostream>
using namespace std;
int main(){
	int n,a;
	cin>>n;
	for(a=0;n>0;a++){
		n=n/10;
	}
	cout<<a;
}
/**************************************************************
	Problem: 1710
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/