import java.util.Scanner;

public class Main {
	public static void main(String[] arg) {
		int a = 0, b = 0;
		Scanner scan = new Scanner(System.in);
		while (scan.hasNext()) {
			a = scan.nextInt();
			b = scan.nextInt();
			System.out.println(String.valueOf(a + b).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