import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
class Main {
    
    public static void main(String[] args) throws IOException {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        String str=br.readLine();
        while(true){
            try{
                StringTokenizer st=new StringTokenizer(str," ");
                int sum=Integer.parseInt(st.nextToken())+Integer.parseInt(st.nextToken());
                System.out.println(String.valueOf(sum).length());
                str=br.readLine();
            }catch(Exception e){System.exit(0);}
        }
    }
    
}
/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