import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.util.StringTokenizer;

class Main {
	public static void main(String[] args) throws NumberFormatException, IOException {
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
		String line = null;
		List<Integer> results = new ArrayList<Integer>();
		
		while ((line = br.readLine()) != null) {
			StringTokenizer st = new StringTokenizer(line);
			if (!st.hasMoreTokens()) break;
			
			int a = Integer.parseInt(st.nextToken());
			int b = Integer.parseInt(st.nextToken());
			
			results.add(Integer.toString(a + b).length());
		}
		
		for (int x : results) {
			System.out.println(x);
		}
	}
}
/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