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