import java.util.*;
  
  public class Main{
  
  public static void main(String[] args) {
    // write your code here  
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        int c=0;
        while(n!=0)
        {
            n=n/10;
            c++;
        }
        System.out.println(c);
      
  }
  }