import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;
 
public class Main {
  public static void main(String args[] ) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String s="";
    while(s != null) {
      s = br.readLine();
      if (s == null ){break;}
      int a = Integer.parseInt(s.split(" ")[0]);
      int b = Integer.parseInt(s.split(" ")[1]);
      System.out.println(String.valueOf(a + b).length());
    }
  }
}
/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