import java.util.Scanner;

public class Main {
	public static void main(String a[]){	
		Scanner scanner = new Scanner(System.in);
		while(scanner.hasNext()){
			int b = scanner.nextInt();
			int c = scanner.nextInt();
			int s = b+c;
			int d = 0;
			while(s!=0){
				s = s/10;
				d++;
			}
			System.out.println(d);
		}
		scanner.close();
	}
}


/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