import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

	public static void main(String[] args)
	{
		Scanner stdIn = new Scanner(System.in);

		List<Integer> list = new ArrayList<Integer>();

		while (stdIn.hasNext())
		{
			int a = stdIn.nextInt();
			int b = stdIn.nextInt();

			list.add(String.valueOf((a + b)).length());
		}

		for (int value : list)
		{
			System.out.println(value);
		}
	}
}
/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