import java.util.Scanner;

public class Main {
  public static void main(String[] args){
	Scanner s = new Scanner(System.in);
	int a , b , sum , valLen;

	while(s.hasNext()){
		String line = s.nextLine();
		String[] array = line.split(" ",0);
		a = Integer.parseInt(array[0]);
		b = Integer.parseInt(array[1]);
		sum = a + b;
		valLen = String.valueOf( sum ).length();
		System.out.println(valLen);
	}
  }
}
/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