#include <iostream>
using namespace std;
int main(){
    int num;
    if(!(cin>>num)){
        cout<<"Invalid input";
        return 0;
    }
    else if(num<=-10000||num=>10000){
        cout<<"Invalid input";
        return 0;
    }
     else if (num==0){
        cout<<1;
        return 0;
    }
    else if (num<0){
        num=-num;
    }
    int count=0;
    while (num>0){
        num/=10;
        count++;
    }
    cout<<count;
    

    return 0;
}