import java.util.Arrays;
import java.util.Comparator;
import java.util.Scanner;

public class Main {
	public static void main(String args[] ) throws Exception {
		Scanner scanner = new Scanner(System.in);
		while(scanner.hasNext()){	
			int a = scanner.nextInt();//??????????????°??????????????????
			int b = scanner.nextInt();//????????????????????????????????°??????????????????
			int ans = a+b;
			ans = String.valueOf( ans ).length();
			System.out.println(ans);
		}
    }
}
/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