import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
    String str;
    while ((str = buf.readLine()) != null) {
      String[] nums = str.split(" ");
      int sum = Integer.parseInt(nums[0]) + Integer.parseInt(nums[1]);
      System.out.println(Integer.toString(sum).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