import java.util.Scanner;
class Main{
    public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		int a, b, sum;
		int digit = 1;
		while(in.hasNextInt()){
			a = in.nextInt();
			if(in.hasNextInt()){
				b = in.nextInt();
			}else{
				break;
			}
			sum = a+b;
			while(sum>=10){
				sum /= 10;
				digit++;
			}
			System.out.println(digit);
			digit = 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