import java.util.Scanner;

public class Main {
	static Scanner sc =  new java.util.Scanner(System.in);

	public static void main(String[] args) {
		
		while ( sc.hasNext() ){
		
		int a = sc.nextInt();
		int b = sc.nextInt();

		int s = a + b ;
		String str = Integer.toString( s );
		
		System.out.println( str.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