import java.io.*;

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