import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main{
    public static void main(String[] a)throws IOException{
    	BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
 		String str = null;
 		String[] strList = new String[2];

 		while((str = in.readLine()) != null){                    
            strList = str.split(" ");

            int sum = Integer.parseInt(strList[0])+Integer.parseInt(strList[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