import java.util.Scanner;

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