import java.io.IOException;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) throws IOException{
		Scanner sc = new Scanner(System.in);
		int a,b;
		int length;
		while(sc.hasNext()){
			a = sc.nextInt();
			b = sc.nextInt();
			length = String.valueOf((a+b)).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