import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String a = sc.next();
    String b = a;
    String n;
    int len;
    int lenans = 4;
    int i = 0;
    n = String.valueOf(i);
    b = a.replace(n,"");
    len = b.length();
    if(len < lenans){
        lenans = len;
      }
    b = a;
    System.out.println(lenans);
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz