import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		int a,b;
		for(;scanner.hasNextInt();){
			a=scanner.nextInt();b=scanner.nextInt();
			System.out.println((int)Math.floor(Math.log10(a+b)+1));
		}
	}

}
/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