import java.io.*;
class Main{
  public static void main(String[] args) {
    try{
      BufferedReader br =
        new BufferedReader(new InputStreamReader(System.in));
      while(true){
        String[] str = br.readLine().split("\\s");
        if(str == null) throw new Exception();
        int a = Integer.parseInt(str[0]) + Integer.parseInt(str[1]);
        String b = "" + a;
        System.out.println(b.length());
      }
    }catch(Exception e){}
  }
}
/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