import java.io.*;
import java.util.*;


public class Main {

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

		String s;
		while ((s = br.readLine()) != null) {
			String[] lc = s.split(" ");
			int a = Integer.parseInt(lc[0]);
			int b = Integer.parseInt(lc[1]);
			
			System.out.println((int)Math.log10(a+b)+1);
		}

	}
}
/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