import java.util.Scanner;
 
public class Main{
    Scanner sc = new Scanner(System.in);
     
    void run(){
        while(sc.hasNext()){
            int a = sc.nextInt();
            int b = sc.nextInt();
            System.out.println(String.valueOf(a+b).length());
        }
    }
     
    public static void main(String[] args) {
        new Main().run();
    }
}
/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