import java.util.Scanner;


public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		while(sc.hasNextInt()){
			int a, b = 0;
			int di = 1;
			a = sc.nextInt();
			b = sc.nextInt();
			a = a+b;
			while(a/10 != 0){
				a /= 10;
				di++;
			}
			System.out.println(di);
		}
	}
}
/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