import java.io.*;
import java.util.*;
public class Main{
 public static void main(String args[]){
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  try{
   String str=null;
   while((str=br.readLine())!=null){
    StringTokenizer st=new StringTokenizer(str);
    int i=Integer.parseInt(st.nextToken());
    int j=Integer.parseInt(st.nextToken());
    System.out.println(String.valueOf(i+j).length());
   }
   br.close();
  }catch(Exception ex){
  System.exit(0);
  }
 }
}
/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