#include<iostream>
#include<string>
#include<cmath>
using namespace std;
int main()
{
    int n;
    cin>>n;
    if(n<-10000||n>10000){
        cout<<"Invalid input"<<endl;
        return 0;
    }
    if(n==0){
        cout<<1<<endl;
        return 0;
    }
    int count=0;
    n=std abs(n);
    while(n>O){
        n/=10;
        count++;
    }
    cout<<count<<endl;
    return 0;
}