#include<iostream>
using namespace std;
int main(){
    int n;
    if(!(cin>>n)){
        cout<<"Invalid input";
        return 0;
    }
    if(n==0){
        count<<1<<endl;
        return 0;
    }
    n=abs(n);
    int count=0;
    while(n>0){
        count++;
        n\=10;
        
    }
    cout<<count;
    return 0;
}