import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

	//0002
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		try{
			String str = br.readLine();
			while(true){
				if(str == null){
					break;
				}
				String[] st = str.split(" ",0);
				int a =  Integer.parseInt(st[0]);
				int b = Integer.parseInt(st[1]);
				int sum = a+b;
				System.out.println(String.valueOf(sum).length());
				str = br.readLine();
			}
		}catch(Exception ex){
			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