import java.io.IOException;
import java.util.Scanner;

public class Main{
	public static void main(String[] args) throws NumberFormatException, IOException{
		int firstinput;
		int secondinput;
		int length;
		Scanner scan = new Scanner(System.in);
		while(scan.hasNext()){
			firstinput = scan.nextInt();
			secondinput = scan.nextInt();
			length = String.valueOf((firstinput + secondinput)).length();
			System.out.println(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