import java.io.*;
import java.util.*;
public class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader buf=new BufferedReader(new InputStreamReader(System.in));
        String t;
        while((t=buf.readLine())!=null){
            String str[]=t.split(" ");
            int x=Integer.parseInt(str[0]);
            int y=Integer.parseInt(str[1]);
         
                System.out.println((int)Math.log10(x+y)+1);
            }
        }
    }
/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