import java.util.Scanner;

class Main{
	public static void main(String args[]){
		Scanner in = new Scanner(System.in);
		while(in.hasNext()){
			int a = in.nextInt();
			int b = in.nextInt();
			int c = (int)Math.log10(a+b) + 1;
			System.out.println(c);
		}
	}
}
/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