#include<iostream>
using namespace std;
int main(){
    int n, c=0;
    cin>>n;
    if (n<-100000 || n>100000){
    cout <<"Invalid input";
    else{
        if(n<0)n=-n;
        if(n==0) c=1;
        while (n>0)
        {
            n/=10;c++;
        }
    }