import java.util.Scanner;

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

		while(sc.hasNext()) {
			int a = sc.nextInt();
			int b = sc.nextInt();
		int sum = a+b;
		int valLen = String.valueOf(sum).length();
		System.out.println(valLen);
		}

	}

}

/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