import java.util.*;

class Main{
    public static void main(String[] args){
        ArrayList<Integer> list = new ArrayList<Integer>();
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()){
            list.add(String.format("%d",Math.abs(sc.nextInt() + sc.nextInt())).length());
        }
        for(int i = 0,size = list.size();i < size;i++){
            System.out.println(list.get(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