import java.util.*;

public class Main {
    public static void main(String[] args) {

    Scanner scan = new Scanner(System.in);
    
    int a,b,total;
    while(scan.hasNextInt()){
    a= scan.nextInt();
    b= scan.nextInt();
    total = a+b;
    int i=1;
    while(true){
        total = total /10;
        if (total == 0){
           System.out.println(i);
           break;
        }
        i++;
    }
    }
    
    
    }
}
/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