import java.io.*;
class Main {
  public static void main(String... args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String s = br.readLine();
    while(s != null) {
      String[] arr = s.split(" ");
      int sum = Integer.parseInt(arr[0]) + Integer.parseInt(arr[1]);
      System.out.println((int)Math.log10(sum)+1);
      s = br.readLine();
    }
  }
}
/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