import java.util.*;
class Main{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		while(sc.hasNextInt()){
			int temp=sc.nextInt();
			temp+=sc.nextInt();
			int count=0;
			//System.err.println(temp);
			while(temp>0){
				temp/=10;
				count++;
			}
			System.out.println(count);
		}
		
	}
}
/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