
import java.io.*;

public class Main {

	//ツ　0002
	public static void main(String[] args) throws IOException {
		
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

		for(;;) {
		
			String s = reader.readLine();
			if (s == null)
				break;
			
			String[] sp = s.split(" ");
			int a = Integer.parseInt(sp[0]);
			int b = Integer.parseInt(sp[1]);
			int c = a+b;
			String ans = "" + c;
			System.out.printf("%s\n", ans.length());
		}
		reader.close();
	}
}
/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