import java.util.*;
public class Main {
    public static void main (String[] args) {
        Scanner inp = new Scanner (System.in);
        while(inp.hasNext()){
            int num_1 = inp.nextInt();
            int num_2 = inp.nextInt();
            int sum = num_1+num_2;
            int digit = (int)(Math.log10(sum)+1);;
            System.out.println(digit);
        }
    }
}
/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