import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {
	public static void main(String[]args){
		DigitNum();
	}
	
	public static void DigitNum(){
			Scanner scan = new Scanner(System.in);
			while(scan.hasNext()){
			int sum = scan.nextInt()+scan.nextInt();
			System.out.println(String.valueOf(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