import java.util.*;
import java.io.*;
import java.math.*;

class Main{
    public static void main(String[] args){
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line;
        try{
            while(null != (line = br.readLine()))
            {
                String[] strArr = line.split(" ");
                System.out.println(String.valueOf(Integer.parseInt(strArr[0]) + Integer.parseInt(strArr[1])).length());
            }
        }
        catch(Exception e){
        }
    }
}
/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