import java.io.*;
import java.util.*;
class Main{
    public static void main(String[] args)throws IOException{
	String a;
	int b;
	InputStreamReader isr=new InputStreamReader(System.in);
	BufferedReader br =new BufferedReader(isr);
	a= br.readLine();
	while(a!=null){
	    StringTokenizer st = new StringTokenizer(a);
	    b=Integer.parseInt(st.nextToken())+Integer.parseInt(st.nextToken());
	    b=(int)Math.log10(b)+1;
	    System.out.println(b);
	    a=br.readLine();
	    }
}
}
/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