import java.io.*;

public class Main{
    public static void main(String[]args)throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str;

        while((str = br.readLine()) != null){
            String[] str2 = str.split(" ");
            int a = Integer.parseInt(str2[0]);
            int b = Integer.parseInt(str2[1]);

            int digits = Integer.toString(a + b).length();
            System.out.println(digits);
        }
    }
}
/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