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

class Main {

	public static void main(String[] args) throws IOException {

		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	      String line;
	      while ((line = in.readLine()) != null) { 

			String[] ab = line.split(" ");

			int a = Integer.parseInt(ab[0]);
			int b = Integer.parseInt(ab[1]);

			 String out =Integer.toString(a+b);
			 System.out.println(out.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