#include<bits/stdc++.h>
using namespace std;
int Length(int n){
    int s=0;
    while(n>0){
        n=n/10;
        ++s;
    }
    return s;
}
int main(){
    int n;
    cin>>n;
    cout<<Length(n);
    return 0;
}
/**************************************************************
    Problem: 2263
    User: acm
    Language: C++
    Result: 正确
    Time:0 ms
    Memory:2016 kb
****************************************************************/