import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try(Scanner scanner = new Scanner(System.in)){
			while(scanner.hasNext()){
				int result = digitNumber(scanner.nextInt(), scanner.nextInt());
				System.out.println(result);
			}
		}
	}
	
	public static int digitNumber(int a, int b){
		return (""+(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