import java.io.*;
import java.util.*;

class Main{
	public static void main(String[] args) throws IOException{
		BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
		String s = r.readLine();
		StringTokenizer st = new StringTokenizer(s," ");
		int a,b;
		while(true){
			try {
				a = Integer.parseInt(st.nextToken().toString());
				b = Integer.parseInt(st.nextToken().toString());
				a+=b;
				for(b=0;a!=0;a=a/10) {
					b++;
				}
				System.out.println(b);
				s = r.readLine();
				if (s==null) break;
				st = new StringTokenizer(s," ");
			} catch (NoSuchElementException e) {
				System.exit(0);
			}
		}
	}
}
/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