#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: linzihang
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/